The 987.1 Cayman has quietly become a $29k car with a $50k ceiling, and the whole spread is decided by mileage, colour and whether the seller bothered to borescope the engine.
Across 467 completed BaT auctions the 987 Cayman sells 86.7% of the time at a median of $28,888 (mean $29,708), with the middle half of the market between $24,500 and $35,000 and full range $8,200–$66,500. That is a remarkably tight interquartile band for a 20-year-old car, and it tells you the model has settled into a mature, well-understood market rather than a speculative one. The trend is up: the last 12 months median $29,750 versus $25,250 the 12 months before, +17.8%. Calendar-year medians show the model peaked at $31,763 in 2021 and $31,750 in 2022, softened to $28,744 (2024) and $27,500 (2025), and has rebounded to $30,000 across 40 sales in 2026 to date.
Mileage is the dominant axis and it is close to linear until it isn't. Sub-20k cars cluster $39,000–$49,500 (No Reserve: 18k-Mile 2006 Porsche Cayman S 6-Speed at $39,000; 16k-Mile 2006 Porsche Cayman S 6-Speed at $40,500; 13k-Mile 2007 Porsche Cayman S 6-Speed at $44,000; Original-Owner, 11k-Mile 2007 Porsche Cayman S 6-Speed at $49,500). The 30k–70k band is the fat middle at $26,000–$36,000. Past 90k the floor drops hard — No Reserve: 2006 Porsche Cayman S 6-Speed at 103k made $15,500 and No Reserve: 2006 Porsche Cayman S 6-Speed at 93k with an undiagnosed knock made $15,500 — unless the engine has been rebuilt, in which case mileage almost stops mattering (No Reserve: 3.8L-Powered 2006 Porsche Cayman S 6-Speed, 128k miles, $41,000).
What moves money at the margin is documentation, not condition claims. The cars that beat their mileage band all showed a borescope, a DME over-rev report, or a credible Blackstone. The cars that missed reserve — 32k-Mile 2006 Porsche Cayman S 6-Speed at $24,250, 42k-Mile 2008 Porsche Cayman S 6-Speed at $28,750, 31k-Mile 2008 Porsche Cayman S 6-Speed at $31,750 — all had low miles and all refused a borescope. Commenter emjaferd's post-mortem on the last of those is the whole thesis: "Borescope or oil analysis would've increased the price and outcome of this auction." Conversely hachi_roku on the 18k-mile car: "Kudos to the seller here. DME report + a borescope? The peanut gallery has nothing to say this time."
Colour is the other lever and it is worth real money on this platform. The colour table shows Carmon Red Metallic at a $40,001 median (n=3) versus Arctic Silver Metallic at $27,625 (n=14) and Basalt Black Metallic at $24,445 (n=4). The two highest recent sales — 34k-Mile 2007 Porsche Cayman S 6-Speed in Nordic Gold at $51,000 and No Reserve: 2007 Porsche Cayman S 6-Speed in Dark Teal at $42,000 on 84,000 miles — are colour plays first and cars second. Base 2.7 cars, long the discount option, now trade almost level with S cars at equal mileage (2008 Porsche Cayman 5-Speed, 68k miles, $30,523; No Reserve: 36k-Mile 2008 Porsche Cayman 5-Speed, $29,750) precisely because they carry no bore-scoring risk.
Original-Owner, 11k-Mile 2007 Porsche Cayman S 6-Speed made $49,500; 13k-Mile 2007 Porsche Cayman S 6-Speed made $44,000; 16k-Mile 2006 Porsche Cayman S 6-Speed made $40,500; No Reserve: 18k-Mile 2006 Porsche Cayman S 6-Speed made $39,000. Comparable 60-70k cars — 2006 Porsche Cayman S 6-Speed at 60k ($29,000) and 2007 Porsche Cayman S 6-Speed at 67k ($30,000) — sit $10-20k lower.
34k-Mile 2007 Porsche Cayman S 6-Speed in Nordic Gold Metallic, believed near one-of-one, made $51,000 — the highest recent sale, on a car with no service records, unknown shifter brand, and 22,000+ Range 1 over-revs. No Reserve: 2007 Porsche Cayman S 6-Speed in Dark Teal Metallic over Sand Beige made $42,000 on 84,000 miles with no maintenance history at all; commenter Shesgonnakillme: "This was at least a $15k bump just for the color." The stats agree: Carmon Red Metallic median $40,001 (n=3) versus Basalt Black Metallic $24,445 (n=4).
No Reserve: 18k-Mile 2006 Porsche Cayman S 6-Speed supplied both and sailed to $39,000. 2006 Porsche Cayman S 6-Speed (60k, Arctic Silver) supplied borescope images, DME, paint meter and cold-start video and made $29,000 against comparable mileage. The three reserve-not-met cars in this sample — 32k-Mile 2006 Porsche Cayman S 6-Speed ($24,250), 42k-Mile 2008 Porsche Cayman S 6-Speed ($28,750) and 31k-Mile 2008 Porsche Cayman S 6-Speed ($31,750) — all had genuinely low miles and all declined a borescope.
No Reserve: 3.8L-Powered 2006 Porsche Cayman S 6-Speed with 128,000 miles made $41,000; 3.8L-Powered 2006 Porsche Cayman S 6-Speed with 93,000 miles made $40,001; 3.8L-Powered 2007 Porsche Cayman S 6-Speed with 122,000 miles made $36,500. Unrebuilt cars at that mileage make $15,500-$23,500. But commenter epaster on the 122k car: "Current bid is the cost of the engine rebuild lol" — the market pays for the work at cost, not at a premium.
3.6L-Powered 2007 Porsche Cayman S 6-Speed (X51 3.6 swap, Softronic tune with SAI file deleted, cannot pass California smog) failed to meet reserve at $27,750. Turbocharged 3.8L–Powered 2006 Porsche Cayman S 6-Speed, a $404rwhp TPC build with cats deleted, failed at $33,000; andy7777: "Really surprised it didn't hit at least $40,000." On 3.8L-Powered 2006 Porsche Cayman S 6-Speed the emissions-monitor exchange with HonkHonk ended with "as they say, 'buy the seller'. Thanks for saving me the money" and the car scraped reserve at exactly $40,001.
29k-Mile 2007 Porsche Cayman S 6-Speed, with Spokayman noting "nearly all of the panels have added paint depth" and a confusing $6,820 Aerokit/repaint receipt, made $31,750 — while 30k-Mile 2006 Porsche Cayman S 6-Speed with clean Carfax and original paint made $34,000. Original-Owner 2007 Porsche Cayman S 6-Speed, single owner but three disclosed accidents and possible welded quarter panel, made only $28,000 at 68k miles.
2006 Porsche Cayman S 6-Speed with 20,000 miles but 20" Champion wheels on 245/305 rubber made $36,000; commenter Bavarianchops post-sale: "If not for the lack of service and the wheels, it would've done 40K but 36K isn't bad…. the wheels are just wrong." Spokayman on 2006 Porsche Cayman S 6-Speed (55k, Basalt Black, H&R springs, subwoofer): "It's a harsh truth that mods, even good ones, do not add market value, and instead often devalue a car."
The analysed manual subset medians $30,000 (n=52). The two Tiptronic sales in the recent set are the two cheapest cars in it: No Reserve: 2008 Porsche Cayman S at $14,500 (74,539 miles) and No Reserve: Japanese-Market 2008 Porsche Cayman S at $15,250 (79,000 miles). 17k-Mile 2008 Porsche Cayman S Design Edition 1, a Tiptronic limited edition with 17k miles, still failed to meet reserve at $31,524 — a manual at that mileage would be $40k+.
2008 Porsche Cayman 5-Speed with 68,000 miles made $30,523 while several 60-70k S cars made $28,000-$30,000. No Reserve: 36k-Mile 2008 Porsche Cayman 5-Speed made $29,750 and 36k-Mile 2007 Porsche Cayman 5-Speed made $30,500. Commenter Primo2013: "The 2.7 Base is not subject to bore scoring like the S models" — buyers are pricing that in.
| Colour | Median | Cars |
|---|---|---|
| Carmon Red Metallic | $40,001 | 3 |
| Seal Gray Metallic | $31,500 | 3 |
| Black | $28,500 | 5 |
| Speed Yellow | $28,000 | 3 |
| Arctic Silver Metallic | $27,625 | 14 |
| Guards Red | $26,994 | 4 |
| Basalt Black Metallic | $24,445 | 4 |
Dinodino on 2006 Porsche Cayman S 6-Speed (59k, Terracotta): "NO the Cayman S from this year does not use the M96 and this year is considered a high risk for bore score… the only way to protect investment is with a bore scope, period end of story." Caymangolfer on No Reserve: 2006 Porsche Cayman S 6-Speed (71k): "The 987 S has more bore score concerns than the base." On 3.6L-Powered 2007 Porsche Cayman S 6-Speed the 2025 inspection actually found light scoring in cylinder 2, and HSWEBB asked whether the ticking in the video was "the beginning of bore scoring noise" — the seller waved it off and the car did not sell.
Check: Insist on a borescope, ideally from the sump side. AnonUseryM9J4 on 2007 Porsche Cayman S 6-Speed (98k, Basalt Black): "The only way to know if you have bore scoring is to do a bore scope and it should be done from the sump side. Period." Supplement with a Blackstone taken on oil with 3,000+ miles on it (not 200), a cold-start video shot from behind the exhaust, and an oil-filter cut. Cylinder 6 and the drive-side thrust faces are the usual victims.
On 2007 Porsche Cayman 5-Speed (89k, engine replaced) jasqaq wrote "The IMS in these engines is not serviceable without a complete disassembly of the engine, which they would not have done for free," and ApexHunter noted the invoice showed only long-block R&R; the seller admitted "I really should've just left that information about the IMS out." Same pattern on No Reserve: 2006 Porsche Cayman S 6-Speed (137k) where Spokayman forced the seller to concede only the flange/seal was likely done. Counterweight from bimmersnob on the same car: "the M97 engines use a larger OD bearing than M96 predecessors, so the 987/997 have a MUCH lower incidence of failure… IMS has never scared me away from a 987 or 997."
Check: Understand the architecture before you believe anyone: all 987.1 cars use the large non-serviceable bearing that requires splitting the case. If a seller claims 'IMS replaced,' demand the engine-out invoice with labour hours. A flange/seal swap or a direct oil-feed kit is a different, lesser thing.
On 36k-Mile 2007 Porsche Cayman 5-Speed the seller pulled a live BaT auction after spotting white cold-start smoke; the diagnosis was a failed AOS, which was replaced and the engine scoped before relisting at $30,500. Spokayman on 2007 Porsche Cayman S 6-Speed (67k, Cobalt Blue): "When the AOS fails it can do so suddenly causing the intake system to flood with motor oil and billows of oil smoke out of the exhaust… This is not something you want to delay in replacing." 916Carl on the same thread: OEM part "around $140… It took me 3 hours and 15 minutes."
Check: Ask when the AOS was last replaced. Cold-start from behind, looking for a sustained white/blue cloud rather than a brief puff. If there is no receipt on a 15+ year old car, budget for it — roughly $632 at a shop or ~$140 in parts DIY.
Nearly every well-prepared car in this set has a water-pump receipt: 2006 Porsche Cayman S 6-Speed (64k, Midnight Blue) had pump, belt, AOS, thermostat and intake gaskets all done November 2025 for ~$6,000 and made $34,000. phlat4 on 15k-Mile 2008 Porsche Cayman S 6-Speed listed the recommissioning bill for a garage queen: "oil change, serpentine belt, break fluid, transmission gear oil, coolant flush and some would recommend proactively replacing the water pump."
Check: Water pump receipt with date and mileage. bones302 raised the specific failure mode — brittle plastic impellers shattering and sending debris into the block. On No Reserve: 31k-Mile 2008 Porsche Cayman S 6-Speed a 17-year-old pump was still fitted and the dealer-seller simply said there were no leaks.
Replaced on No Reserve: 2006 Porsche Cayman S 6-Speed (137k), 30k-Mile 2006 Porsche Cayman S 6-Speed, No Reserve: 2008 Porsche Cayman S 6-Speed (81k, Speed Yellow) and 2008 Porsche Cayman 5-Speed; still sagging on 32k-Mile 2006 Porsche Cayman S 6-Speed and 2006 Porsche Cayman S 6-Speed (59k). On No Reserve: 31k-Mile 2008 Porsche Cayman S 6-Speed the prior owner awesomekaptain volunteered that the "headliner was toast when I sold the car."
Check: Look at photos of the rear hatch lining specifically, not just the roof. Spokayman prices a professional replacement at around $1,000; Trademan8284 says DIY is feasible under $100.
32k-Mile 2006 Porsche Cayman S 6-Speed disclosed "foam emission is evident from the climate vents," then contradicted itself in a later video claiming the vents were clean — it failed to meet reserve at $24,250. 3.8L-Powered 2007 Porsche Cayman S 6-Speed disclosed "foam blowing through the vents which is a common malady." Worn or sticky climate switches noted on 44k-Mile 2006 Porsche Cayman S 6-Speed, 2006 Porsche Cayman S 6-Speed (104k) and others.
Check: Run the fan on high with the car cold and look for black foam flakes on the dash. Spokayman: patchable for ~$25 in parts plus labour, or a full fix requiring dash removal at serious cost. Also press every climate and centre-stack button for the tacky, peeling soft-touch coating.
On No Reserve: 3.8L-Powered 2006 Porsche Cayman S 6-Speed the seller found "a small piece of coil spring on the garage floor" — both rear springs had broken — and the subsequent teardown found seized parts requiring a full rear suspension rebuild. On 31k-Mile 2006 Porsche Cayman S 6-Speed a right rear shock was seeping and left unrepaired; Snowman87: "seeping or not, it needs to go." Dr_Outback on 13k-Mile 2007 Porsche Cayman S 6-Speed: "I bought a 5300 mile, 2011 Boxster S on here and the front and rear bump stops are rotted out" — a $2.7k repair. On 3.8L-Powered 2006 Porsche Cayman S 6-Speed a front strut had "slid down in the mount."
Check: Have the car on a lift and inspect both rear springs for cracks at the lower coils, check for strut seepage, and pull the boots to look at bump stops. Low-mileage cars are worse, not better.
No Reserve: 2006 Porsche Cayman S 6-Speed (103k, Arctic Silver) could not complete the secondary air monitor after repeated drive cycles and sold for just $15,500. Commenter 777AIA offered the diagnostic shortcut: "Check to be sure that both fans are working. If one of the fans is out, you will get the secondary air monitor error… the mechanic said that was the fourth time he had seen the error with the fan." On 3.6L-Powered 2007 Porsche Cayman S 6-Speed the Softronic tune deleted the SAI file outright; the car did not sell.
Check: Get a scan showing all OBD-II monitors 'Ready' — not just 'no CEL.' A car with a cleared battery or a tune that deletes the SAI file will show 'Not Ready' and fail inspection.
44k-Mile 2008 Porsche Cayman S 6-Speed needed a clutch at 44,000 miles; Dinodino flagged that neither the RMS nor the IMS seal was documented as done during that job. Avcat123 on 2008 Porsche Cayman S 6-Speed (110k, still on its original clutch): "Expect a clutch replacement soon! I'm on my second clutch at 106k." On No Reserve: 3.8L-Powered 2006 Porsche Cayman S 6-Speed the shifter cables broke twice.
Check: Ask for the clutch date and mileage; if the box has been out, ask whether the RMS was done and the IMS grease seal removed at the same time (Dinodino's standard question). Test the shift for vagueness — cables are a known break point.
15k-Mile 2008 Porsche Cayman S 6-Speed wore 2014-2015 Michelins; por356c: "After about 6-7 years, any tires useful, safe life is over. I know this because I am in the rubber business." 17k-Mile 2008 Porsche Cayman S Design Edition 1 was still on its original 2007 tyres and the seller had the dates wrong until Dr_Outback corrected him. Original-Owner, 11k-Mile 2007 Porsche Cayman S 6-Speed was on roughly 2015 rubber.
Check: Read the DOT date codes in the photos yourself; sellers get this wrong. Budget $1,200-1,800 for a set.
Spokayman on 2006 Porsche Cayman S 6-Speed (64k, Midnight Blue): "Range 4 & 5 overrevs can cause damage but in this case shows only 1 spark plug firing each… when only 1 is recorded it is an (electrical?) anomaly and not actually real." On 34k-Mile 2007 Porsche Cayman S 6-Speed he flagged "22,000+ range one revs" before other commenters concluded it was benign soft-limiter activity — the car still made $51,000. On 2006 Porsche Cayman S 6-Speed (55k) he caught a DME showing 959 engine hours against 55k miles: "it would have had to average over 57MPH including idling time."
Check: Pull the DME report and read it properly. Ranges 1-2 are near-meaningless; Range 3 is common; Ranges 4-6 matter, and a single-ignition count in Range 4/5 is usually an electrical artifact rather than a real event. Note the engine hours at which they occurred versus total hours.
Driver-grade, $16,000-$24,000: 90k+ miles, or a Tiptronic, or an emissions/paint/accident problem. Expect to spend $3,000-6,000 immediately on cooling system, AOS, tyres and headliner, and accept unquantified bore-scoring risk on an S. The base 2.7 five-speed is the smart play in this band because the engine risk is materially lower.
Strong driver, $27,000-$33,000: 45,000-75,000 miles, clean Carfax, original paint, manual, with a documented water pump/AOS/clutch history and ideally a borescope. This is where the median lives and where most of the volume trades — 2006 Porsche Cayman S 6-Speed (64k, Midnight Blue, $6,000 of fresh service) at $34,000 and No Reserve: 2006 Porsche Cayman S 6-Speed (71k, Kelly Moss service) at $30,000 are the reference points.
Best-in-class, $38,000-$45,000: sub-30,000 miles, one or two owners, original paint verified by meter, full records plus borescope and DME. No Reserve: 18k-Mile 2006 Porsche Cayman S 6-Speed at $39,000 and 16k-Mile 2006 Porsche Cayman S 6-Speed at $40,500 define this tier.
Above $45,000 you are paying for colour or single-digit-thousand mileage — Nordic Gold at $51,000, Carmon Red at 11k miles for $49,500. That is collector money on a car whose all-time BaT high is $66,500; treat it as a discretionary purchase, not a value one.
A properly documented 3.8L Flat Six Innovations rebuild is worth $36,000-$41,000 regardless of odometer, but you are buying the rebuild at cost, so it makes sense only if you actually want the extra 40-50hp and the bore-scoring problem permanently solved.

$51,000 is the top recent sale and roughly $17k above the 34k-mile trend line. Paint-to-sample Nordic Gold Metallic, believed one-of-one or near it, plus enthusiast mods (FVD deep sump, third radiator, GT3 control arms) endorsed publicly by a former owner in the thread. Notably the car had no service records, an unknown shifter brand, 22,000+ Range 1 over-revs, a rotor description that didn't match the photos, and a seller who declined to pull a wheel. Colour and a credible prior-owner voice bought over the top of all of it.

The mileage record-setter: 11,000 miles, one owner since new, Carmon Red Metallic over Natural Brown, complete provenance, and a DME report supplied on request that Spokayman judged good. Sold despite an unsympathetic cold-rev in the video, 10-year-old tyres and a non-DOT Fabspeed exhaust with the original gone.

$42,000 on 84,000 miles is roughly $12-14k above where that mileage normally lands, on a car with no paper service records at all, unbranded lowering springs, unknown clutch history and borescope photos so poor commenters couldn't read them. Dark Teal Metallic over Sand Beige did the work — Shesgonnakillme: "This was at least a $15k bump just for the color."

128,000 miles and $41,000 — nearly triple what a stock car at that mileage brings. A Jake Raby / Flat Six Innovations Stage II 3.8 with Nickies, IMS Solution, ~44k trouble-free miles since the 2021 rebuild, cats retained, and a thick file. Proof that a documented big-bore rebuild resets the mileage clock in buyers' minds. The seller conceded he had "way more in it than I can recoup."

The bottom of the recent market at $14,500 for 74,539 miles. Tiptronic, an oil analysis showing high iron that ScarySpikes called "a big red flag," a 2-3 foot rocker-panel gouge repaired with bondo on a generic receipt with no letterhead, and a failed prior Cars & Bids attempt. Everything that suppresses a 987 price, stacked in one car.

93,000 miles, a knock at idle that the seller declined to diagnose, no borescope, no oil analysis, no DME, and 15-year-old tyres — despite a genuinely rare PASM/Sport Chrono/adaptive sport seat spec. The market priced it as an engine-out car.

103,000 miles with an incomplete secondary air monitor that would not clear after multiple drive cycles, plus prior paintwork on the passenger door and fender and a notably smoky cold start. Unsellable in a testing state, and the price reflects it — bernie530 still called it "the deal of the century."

Reserve not met at $31,750 in November 2025 — then the same car, as No Reserve: 31k-Mile 2008 Porsche Cayman S 6-Speed, sold for $27,987 six weeks later. A clean natural experiment in what refusing a borescope costs: emjaferd's post-mortem was "Borescope or oil analysis would've increased the price and outcome of this auction," and the eventual buyer's mechanic found no scoring anyway.
These are patterns, not findings. A public auction record cannot show intent, and everything below has ordinary explanations — specialists and dealers bid on many cars of one model, enthusiasts run up cars they end up losing, and new accounts are usually just new. Read them as places to look closely, not as accusations.
watch Underbidder placed much of the ladder — sailingbro placed 6 of 17 bids (35%) and did not win. Enthusiastic losing bidders are common; a very high share is still worth reading the thread for.
watch Closing bids came almost entirely from accounts with no posting history — 11 of 11 bids in the final 15 minutes (100%) came from accounts with under 25 lifetime likes (sailingbro, pirgi10, Craig_009, joshuairiye). The typical auction for this model runs 73%, so this one is an outlier. Note the measure is weak — likes come from commenting, so a long-time bidder who never posts also scores zero.
notice Price set by two accounts trading bids — 60% of the ladder is the same two accounts alternating. This is what a genuine duel looks like too — it only matters alongside another signal.
watch Closing bids came almost entirely from accounts with no posting history — 7 of 7 bids in the final 15 minutes (100%) came from accounts with under 25 lifetime likes (cofibration, pete_agler). The typical auction for this model runs 73%, so this one is an outlier. Note the measure is weak — likes come from commenting, so a long-time bidder who never posts also scores zero.
watch Closing bids came almost entirely from accounts with no posting history — 9 of 9 bids in the final 15 minutes (100%) came from accounts with under 25 lifetime likes (blake_titus, bombus, itsstar, jjolson09). The typical auction for this model runs 73%, so this one is an outlier. Note the measure is weak — likes come from commenting, so a long-time bidder who never posts also scores zero.
watch Underbidder placed much of the ladder — Cargeek81 placed 15 of 40 bids (38%) and did not win. Enthusiastic losing bidders are common; a very high share is still worth reading the thread for.
notice Price set by two accounts trading bids — 63% of the ladder is the same two accounts alternating. This is what a genuine duel looks like too — it only matters alongside another signal.
watch Underbidder placed much of the ladder — Nighthawk85 placed 13 of 39 bids (33%) and did not win. Enthusiastic losing bidders are common; a very high share is still worth reading the thread for.
watch Underbidder placed much of the ladder — sj987 placed 9 of 30 bids (30%) and did not win. Enthusiastic losing bidders are common; a very high share is still worth reading the thread for.
watch Closing bids came almost entirely from accounts with no posting history — 7 of 7 bids in the final 15 minutes (100%) came from accounts with under 25 lifetime likes (pnytko, blookin, wedge22, la84thesky). The typical auction for this model runs 73%, so this one is an outlier. Note the measure is weak — likes come from commenting, so a long-time bidder who never posts also scores zero.
watch Closing bids came almost entirely from accounts with no posting history — 15 of 15 bids in the final 15 minutes (100%) came from accounts with under 25 lifetime likes (DRHondaguy, JWhit, Knine911, mrstammy). The typical auction for this model runs 73%, so this one is an outlier. Note the measure is weak — likes come from commenting, so a long-time bidder who never posts also scores zero.



























































