1988 Porsche 911 Turbo Cabriolet M505 Slant Nose (930) Market Value & Price History
The 1988 Porsche 911 Turbo Cabriolet M505 Slant Nose (930) has a current market value of $268,386 as of Oct 12, 2026, based on 13 verified auction sales tracked by DriveIndex, with half of the verified USD sales since 2021 between $176,000 and $257,794. Based on US sales through Sep 1, 2026. 3 have sold in the past 12 months. The median sale price is up 38.3% over the past 12 months versus one to three years ago.
Data: DriveIndex. 13 verified auction sales for the 1988 Porsche 911 Turbo Cabriolet M505 Slant Nose (930), latest sale Sep 1, 2026. Value as of Oct 12, 2026. Methodology
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The median 1988 Porsche 911 Turbo Cabriolet M505 Slant Nose (930) sold for $209,900 in 2025, against $200,930 in 2022. Each row is the median of the verified sales recorded in that calendar year, so it moves with the mix of mileages and options that came to market as well as with the market itself.
| Year | Median sale | Sales |
|---|---|---|
| 2025 | $209,900 | 4 |
| 2023 | $270,000 | 3 |
| 2022 | $200,930 | 3 |
Years with fewer than three verified USD sales are omitted — a one-sale “median” is a single car, not a market.
Recent 1988 Porsche 911 Turbo Cabriolet M505 Slant Nose (930) Auction Results
| Sold | Price | Mileage | Gearbox |
|---|---|---|---|
| Sep 1, 2026 | $275,000 | 40,000 mi | Manual |
| Dec 16, 2025 | $235,000 | 48,000 mi | Manual |
| Dec 5, 2025 | $257,794 | 39,000 mi | Manual |
| Aug 15, 2025 | $184,800 | 38,600 mi | Manual |
| Apr 15, 2025 | $176,000 | 42,000 mi | — |
| Aug 7, 2024 | $188,000 | 44,000 mi | Manual |
| Dec 21, 2023 | $270,000 | 8,000 mi | — |
| Sep 17, 2023 | $150,000 | 57,000 mi | Manual |
| Apr 18, 2023 | $332,000 | 2,700 mi | — |
| Dec 4, 2022 | $137,505 | 65,000 mi | Manual |
| Sep 13, 2022 | $215,000 | 39,000 mi | Manual |
| Aug 12, 2022 | $200,930 | 39,000 mi | Manual |
| Jul 16, 2021 | $140,000 | 42,000 mi | Manual |
Verified results from the world's leading collector-car auction houses and marketplaces.
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Porsche 911 Turbo Cabriolet M505 Slant Nose by Year
1988 Porsche 911 Turbo Cabriolet M505 Slant Nose (930): Frequently Asked Questions
How much is a 1988 Porsche 911 Turbo Cabriolet M505 Slant Nose (930) worth?
A 1988 Porsche 911 Turbo Cabriolet M505 Slant Nose (930) is worth approximately $268,386 as of Oct 12, 2026, based on 13 verified auction sales tracked by DriveIndex. Based on US sales through Sep 1, 2026. Half of all verified sales fall between $176,000 and $257,794; the full verified range is $137,505 to $332,000. Condition, mileage and options move an individual car within that band.
How much did a 1988 Porsche 911 Turbo Cabriolet M505 Slant Nose (930) cost new?
The 1988 Porsche 911 Turbo Cabriolet M505 Slant Nose (930) carried an original MSRP of $110,000. Verified examples now trade around $268,386.
How much has the 1988 Porsche 911 Turbo Cabriolet M505 Slant Nose (930) depreciated?
It hasn't depreciated. The 1988 Porsche 911 Turbo Cabriolet M505 Slant Nose (930) is worth about 144% more than its original MSRP of $110,000, with verified examples now trading around $268,386. That compares today's value with the sticker price, not adjusted for inflation.
How many 1988 Porsche 911 Turbo Cabriolet M505 Slant Nose (930) sell per year?
3 have sold at auction in the past 12 months. DriveIndex has tracked 13 1988 Porsche 911 Turbo Cabriolet M505 Slant Nose (930) sales in total.
Are 1988 Porsche 911 Turbo Cabriolet M505 Slant Nose (930) sale prices higher or lower than a year ago?
The median 1988 Porsche 911 Turbo Cabriolet M505 Slant Nose (930) sale price is up 38.3% over the past 12 months versus one to three years ago, based on verified auction sales. That figure tracks the median of what actually sold, so it moves with the mix of mileages and options that came to market as well as with the market itself. The full Value Signal classification (appreciating, stable, bottomed, or depreciating) and its 1–5 year projection are part of DriveIndex Pro.
Where can I buy a 1988 Porsche 911 Turbo Cabriolet M505 Slant Nose (930)?
DriveIndex tracks for-sale listings and auction results for the 1988 Porsche 911 Turbo Cabriolet M505 Slant Nose (930) from the world's leading collector-car auction houses and marketplaces.
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