There are two ways to buy a 944 Turbo. The first is to compare asking prices, chase the lowest odometer reading, and pay a premium for the letters “Turbo S” on the hatch. The second is to look at what the cars actually sell for. The two methods do not give the same answer, and the gap runs to tens of thousands of dollars.
We pulled every 944 Turbo transaction indexed between July 2025 and July 2026 on the platforms that publish their results — Bring a Trailer, PCARMARKET, Cars & Bids, Mecum, Barrett-Jackson, RM Sotheby's, Bonhams. Eighty-one sales in all, of which forty-seven have both the mileage and the hammer price on record. That is the sample that talks.
944 Turbo, trending up
under 50,000 miles
above 50,000 miles
on either side of the threshold
Mileage is not a slope, it is a step
The common assumption is that an old car's value decays steadily with the miles. On the 951 that is simply wrong. The data draws two almost watertight populations, separated by a threshold around fifty thousand miles, and almost nothing happens in between.
View the data
| Model year | Miles | Price | Note |
|---|
The practical reading is brutal. Below the threshold, every ten thousand miles saved is worth roughly eight to twelve thousand dollars. Above a hundred thousand miles the odometer almost stops mattering and condition takes over: that zone holds one car at $6,200 and another at $31,900, separated by their paperwork, not by their miles.
A quarter of the lots carry the TMU marking — true mileage unknown. On this model that is not necessarily fraud: the odometer fails through a nylon gear that strips, a documented design weakness, often triggered by zeroing the trip meter while the car is moving. The best-selling car in our sample, at $80,000, is itself TMU. But a buyer who pays the low-mileage premium without demanding the documentation is paying for a belief, not a fact.
A 1987 with 16,000 miles found no buyer at $25,000 in June 2026. On the mileage grid it should have been worth triple that.
The “Turbo S” premium does not exist
This is the most counter-intuitive finding of the exercise, and the most profitable. The 944 Turbo S — 1,635 built, 250 horsepower, M030 suspension, limited-slip differential, uprated brakes — is dozens of times rarer than the ordinary Turbo. It commands seven per cent more. And its market ceiling is forty-three per cent lower.
| Over twelve months | 944 Turbo | 944 Turbo S |
|---|---|---|
| Market benchmark | $27,784 | $29,800 |
| Average sale price | $28,144 | $29,930 |
| Highest sale | $80,000 | $45,500 |
| Number of sales | 81 | 6 |
| Trend | ↑ rising | ↓ falling |
The explanation is structural and it fits in one sentence: for the 1989 model year, the ordinary 944 Turbo received the Turbo S's 250-horsepower engine as standard. A buyer who wants the power buys a 1989 — there are more of them, they are better equipped, they often carry dual airbags, and they live in a liquid market. The numbers confirm it without ambiguity: four 1989s sold for $55,000, $61,000, $61,000 and $61,500, all above the Turbo S record for the period.
Honesty about how solid this finding is: six sales in twelve months do not constitute a market, and two of those six lines are the same car, run twice seven weeks apart — $13,750, then $13,500. But that is precisely the problem. A model whose value cannot be established is a model that resells badly.
Do not pay for the badge. Pay for a documented 1989: same mechanicals, deeper market, rising trend. And if originality matters less to you than the drive, know that on this model a quality build does not destroy value — three explicitly modified cars in our sample sold for $61,000, $37,000 and $36,000, all in the top third. The 951 is judged as a driver's car, not as a collectible 911.
The asking price is not the price
Here is the arithmetic every buyer should do before being seduced by a cheap listing. Take two real 2026 sales: a car gone at $14,560 at Bonhams in May, and another at $35,000 on PCARMARKET in June. Twenty thousand dollars apart.
Now let us cost the deferred maintenance the cheap car almost certainly carries, using published rates only.
This is the central trap of the model and it catches experienced buyers. “Cheap” and “a good deal” are not synonyms. A fifteen-thousand-dollar 951 with a slipping clutch is a car whose repair costs more than the car.
The five economic rules of the 951
This model has a quirk buyers discover too late: its maintenance cost depends less on what you repair than on when you repair it. Mechanical access is expensive; the parts, often, are not.
- Everything that lives behind the timing belt gets done at the same time as the belt. Water pump, thermostat, front seals, cam tower seals: six to ten hours each in isolation, one to two incremental hours when grouped.
- Everything that lives behind the flywheel gets done at the same time as the clutch. Factory book time is twenty hours for a two-piece crossover, twenty-four for a one-piece. Rear main seal, torque tube bearings, crankshaft sensors: across four separate visits, expect three times the price.
- A $245 turbo coolant pump protects a $2,024 turbo. It must keep running for about twenty-five seconds after the engine is switched off, so the oil does not coke in the bearings. The test is free and done by ear, on the seller's kerb. It is the highest-return check of the entire purchase.
- Emulsion in the expansion tank means oil cooler seals, not a head gasket. Six hundred and fifty to thirteen hundred and fifty dollars, against twenty-four hundred to forty-six hundred. A four-fold gap, on the most frequently missed diagnosis on this model. Demand a block test before authorising a cylinder head.
- Structural rust is the only item with no ceiling. There is no reproduction panel for the frame rails, the torque tube crossmember or the battery tray: it is bespoke fabrication. Beyond roughly ten thousand dollars of metalwork on a car worth twenty-eight thousand, the arithmetic stops working.
Where to look, and in what order
The first five points below are free and need no tools — done at the seller's, before price is even mentioned.
On the paperwork, one requirement outranks all the others: proof that the belts were re-tensioned, not merely fitted. New belts must be re-tensioned after the first two thousand miles, then again fifteen thousand miles later. Ninety per cent of service files omit this, and the 951's engine is an interference design: a failure means at least one bent valve, and up to eight depending on how it lets go. The Porsche Club of America's formula remains the best — belts are cheaper than valves.
What really decides the price achieved
If we had to keep one lesson from these forty-seven sales, it would be this one. On the auction platforms, every car that cleared its reserve at a strong price carried a dated, recent record of the belt and water pump service. Cars whose belt dated from 2010 or 2016 sold at the bottom of the range, whatever their odometer, their colour or their model year.
That is not trivial. It means the most predictive variable in a 951's price is neither its mileage, nor its version, nor its rarity: it is a two-thousand-dollar workshop invoice. A seller who cannot produce it is selling a discounted car, and a buyer who demands it before negotiating has just won the strongest argument in the conversation.
Colour is not a causal factor, it is a marker. Cars kept thirty-five years with thirty thousand miles are statistically cars bought new in a showcase shade, and cherished. Do not pay for the colour — pay for what it signals.
And if you buy south of the border
For a Canadian buyer the American market is six times deeper, but the asking price means nothing until it is landed at home. Verified good news: a 944 more than twenty-five years old enters Canada at zero per cent duty, under tariff item 9966.00.00, on two conditions — age is calculated on the real month and year of manufacture, not the model year, and the vehicle must conform to its original configuration. A heavily modified 951 does not qualify.
Less widely known: the Canadian twenty-five per cent surtax on American vehicles is still in force in 2026 and it hits private importers and used vehicles too. A Porsche escapes it for two independent reasons — it is marked Made in West Germany, therefore not of American origin, and since 1September 2025 tariff item 9966 has been explicitly removed from the scope of the surtax.
| On a US$30,000 purchase, landed in Quebec | CAD |
|---|---|
| Customs duty and surtax | $0 |
| GST 5%, collected at the border | $2,119 |
| QST 9.975%, collected at registration | $4,217 |
| A/C excise, brokerage, export declaration | $400 – $800 |
| Provincial mechanical inspection and registration | $525 – $600 |
| Enclosed transport from the Northeast | $1,550 – $2,820 |
| Pre-purchase inspection at a specialist | $705 – $1,304 |
| Total ancillary costs | $9,500 – $11,900 |
The multiplier to memorise is simple: an asking price in US dollars, multiplied by 1.62, plus three to four thousand five hundred Canadian dollars of transport, inspection and administration. Two details of geography are each worth several thousand dollars. A New York–Montreal move in an enclosed truck costs less than a Miami–Montreal move in an open one — buying in the Northeast saves two thousand five hundred to three thousand five hundred US dollars. And the season counts: June to August costs fifteen to thirty per cent more, the cheapest windows being late September and early December.
Exemption from the federal RIV programme, earned at fifteen years, does not exempt you from the provincial mechanical inspection, which is mandatory with no age exemption. And the SAAQ requires a prior call to Revenu Québec for any vehicle twenty-five years or older coming from outside Canada: it is Revenu Québec that sets the QST base, which is the largest variable number in the whole file.
What the market rewards
The 944 Turbo is rising. The benchmark trends upward, seventeen per cent of sales clear forty thousand dollars, and the ceiling has been multiplied by roughly 1.6 since 2019. But the tide does not lift every boat equally, and three resales less than twelve months apart in our sample show +6%, +12% and −2%: the rise is real, it is slow, and it does not cover transaction costs over a year. This is not an asset to flip.
This market rewards quality massively and barely penalises modification. The worst possible purchase is a hundred-thousand-mile car at eighteen thousand dollars that needs work. The best value-to-risk ratio today is a documented 1989 between thirty-five and forty-five thousand US dollars, under sixty thousand miles, with a belt file carrying proof of re-tensioning.
And on a twenty-eight-thousand-dollar car, a full pre-purchase inspection with compression and leak-down costs between five hundred and nine hundred and twenty-five dollars — three point two per cent of the price. A single rocker panel costs two to five times that. It is the simplest calculation in this entire dossier.