Modern Porsche GT cars dominate value retention: ten of the fifteen cars on this list wear a Porsche badge, led by the 992 GT3 (avg $275K over 82 sales, still climbing) and 991 GT2 RS. Corvette ZR1s, the 991 Speedster, the Cayman GT4 RS, and the fifth-generation Viper round out the field. Every model here passed a hard test: its 12-month average did not fall more than 10% below the year before, on real sales in both windows. Limited production, manual gearboxes, and strong enthusiast communities are the common threads.















| Model | Avg Price | Typical Range | Sales | 12-mo Trend | Est. YoY | Avg Mileage |
|---|---|---|---|---|---|---|
| Porsche 992 GT3 | $274,526 | $221,640 – $347,700 | 77 | +3.9% | +3.9% | 3,325 |
| Porsche 991 GT3 | $190,379 | $108,964 – $302,800 | 53 | +8.9% | +2.1% | 13,677 |
| Porsche 991 Carrera S | $93,306 | $63,299 – $162,300 | 44 | +31.1% | +1.7% | 31,715 |
| Porsche 992 GT3 RS | $409,550 | $349,800 – $472,000 | 37 | +4.5% | +2.7% | 897 |
| Ford S550 Shelby Mustang GT500 | $111,917 | $78,401 – $174,980 | 37 | +44.8% | +1.9% | 2,112 |
| Porsche 992 Turbo | $259,316 | $200,300 – $390,850 | 34 | — | +2.7% | 5,540 |
| Porsche 991 GT2 RS | $468,142 | $336,389 – $637,250 | 34 | -0.2% | +3.0% | 3,876 |
| Chevrolet Corvette C7 ZR1 | $224,124 | $167,075 – $296,075 | 34 | -5.4% | +2.6% | 4,497 |
| Porsche 991 Speedster | $439,629 | $300,568 – $574,200 | 30 | +13.8% | +3.2% | 1,772 |
| Porsche 718 Cayman GT4 RS | $196,321 | $176,600 – $219,400 | 27 | -2.6% | +0.8% | 1,857 |
| Audi 42 R8 | $131,040 | $79,501 – $192,500 | 27 | — | +1.8% | 20,593 |
| Porsche 991 Turbo | $145,118 | $94,000 – $263,750 | 26 | — | +1.1% | 23,325 |
| Chevrolet Corvette C6 ZR1 | $104,631 | $81,000 – $140,500 | 26 | — | +1.9% | 7,858 |
| Porsche 981 Cayman S | $56,856 | $43,250 – $76,000 | 21 | — | +2.2% | 32,938 |
| Porsche 991 GT3 RS | $252,325 | $217,879 – $313,050 | 20 | — | +0.9% | 4,757 |
Based on 527 sold listings from the last 2 years across Bring a Trailer, Cars & Bids, eBay Motors, PCarMarket, Collecting Cars, and other auction and marketplace sources. Prices are normalized to USD. Typical ranges show the 5th–95th percentile of sold prices. Stats update daily.