Porsche 911 GT3 (991)
The market for the Porsche 911 GT3 (991) presents a high-confidence signal for price appreciation with probabilities of 0.54 over 6 months, 0.58 over 12 months, and 0.62 over 24 months, though within a volatile regime. Despite appreciation momentum at 42.1, there is an undervaluation score of 51.44, and the strongest leading indicator is the Case-Shiller National Home Price, correlating at 0.78 with a 1-month lead.
What It's Actually Worth
Blended value of a standard 7 yr, 9k mi example, ~$197K now. The green line weighs confirmed auction sales most heavily (the amber dots — what cars actually hammered for), blends in fast-selling "just-missed" listings, and lightly smooths out month-to-month composition noise.
Did our model work? 68% direction calls right
Each faint amber line is a forecast we would have made at that point in the past (12-mo horizon), drawn against what actually happened (blue). Over 50 scored forecasts: 68% got the direction right, median value error ±13%.
Walk-forward: each ghost uses only data available at that date — no hindsight. Data-backed market intelligence, not a guaranteed prediction. Figures are modeled estimates from asking prices, sold comps, and public economic indicators; they can be wrong. Not financial advice.
Auction Scorecard gavel in range 9 in 10
We replayed 556 past auctions in this market — predicting each hammer price from market data before the sale (no hindsight). Typical miss: ±15%; the gavel landed inside our predicted range 9 in 10 of the time, and we lean slightly low on average.
| Sold | Car | Our range | Hammer | |
|---|---|---|---|---|
| 2026-08-26 | 2016 · 19k mi | $120K–$269K | $306K | ✗ |
| 2026-08-25 | 2018 · 4k mi | $156K–$349K | $222K | ✓ |
| 2026-08-15 | 2016 · 6k mi | $147K–$328K | $264K | ✓ |
| 2026-08-15 | 2016 · 11k mi | $129K–$289K | $226K | ✓ |
| 2026-08-14 | 2015 · 6k mi | $145K–$325K | $185K | ✓ |
| 2026-08-13 | 2019 · 10k mi | $132K–$295K | $241K | ✓ |
| 2026-08-07 | 2015 · 43k mi | $90.9K–$203K | $128K | ✓ |
| 2026-08-06 | 2019 · 20k mi | $120K–$268K | $278K | ✗ |
Live now — calling it before the gavel
We're currently tracking 8 open auctions in this market. Here's our predicted hammer range for each — check back after they close.
| Closes | Car | Source | Our predicted range |
|---|---|---|---|
| open | 2019 · 3k mi | ebay | $137K–$389K ($231K) |
| open | 2019 · 3k mi | BaT | $136K–$388K ($230K) |
| open | 2018 · 4k mi | ebay | $136K–$387K ($230K) |
| open | 2019 · 3k mi | ebay | $137K–$390K ($231K) |
| open | 2018 · 4k mi | ebay | $131K–$372K ($220K) |
| open | 2016 · 12k mi | classic | $100K–$284K ($169K) |
| open | 2018 · 4k mi | classic | $125K–$352K ($210K) |
| open | 2019 · 4k mi | classic | $125K–$353K ($210K) |
No-lookahead: predictions are made before each auction closes; the scorecard grades confirmed sold auctions only (no-sales excluded). A modeled estimate, not a guarantee. Data-backed market intelligence, not a guaranteed prediction. Figures are modeled estimates from asking prices, sold comps, and public economic indicators; they can be wrong. Not financial advice.
Where We Think It's Headed
Probability and range, not a single number. Wider = less certain (not bigger gains).
| Horizon | Direction | Probability | Confidence | Past accuracy |
|---|---|---|---|---|
| 6 mo | UP | 54% | Low | 50% |
| 12 mo | UP | 58% | Low | 68% |
| 24 mo | UP | 62% | Low | 74% |
Data-backed market intelligence, not a guaranteed prediction. Figures are modeled estimates from asking prices, sold comps, and public economic indicators; they can be wrong. Not financial advice.
Lead Indicator Forecast
Some indicators move before this market does. High-Yield Bond Spread has historically led it by about 11 months — so its recent move implies where prices head next (dashed). The solid green line is actual value through today; the shaded path is what the lead implies.
Crystal Ball — What Leading Indicators Signal
Distinct from the trend forecast above: this blends all 8 leading indicators (each at its own lead time, de-duplicated so correlated ones don't double-count) into one signal. Leading indicators are collectively signaling lower over the next ~12 months (moderate conviction — 51% of weighted drivers agree), driven mainly by Trade-Weighted Dollar Index and U. Michigan Consumer Sentiment, though Real Disposable Income per Capita points the other way.
Are the indicators agreeing?
Each bar is one driver's current push; longer = more weight. All one side = high conviction; split = low.
If You’d Bought in 2019
$100K invested 2019-11 → today (6.8 yrs), this car vs where else you could've put the money. Rebased to 100 at the start; the dashed line is inflation (break-even).
What This Market Follows
Specialty-car prices don't move in a vacuum. These economic indicators have historically led this market — tap one to see it shifted forward by its lead time, overlaid on the value line.
LVMH (luxury proxy ADR) leads by about 12 months (moves with this market, correlation 0.70). Shown shifted forward 12 months so its turns line up with the market's.
Why We Think This
Current Inventory Snapshot
Comparable Markets
| Market | Undervaluation | Appreciation | Liquidity |
|---|---|---|---|
| Porsche 911 GT2 RS (991) | 13 | 57 | 45 |
| Porsche 911 GTS (991) | 55 | 48 | 48 |
| Porsche 911 Turbo (991) | 50 | 51 | 45 |
Recent Signals & Alerts
- vin returned higher VIN relisted +$28,909 vs prior
- vin returned lower VIN relisted $-50,009 vs prior
- vin returned higher VIN relisted +$41,000 vs prior
- vin returned lower VIN relisted $-72,899 vs prior
- vin returned lower VIN relisted $-50,009 vs prior
- vin returned higher VIN relisted +$41,000 vs prior
Data-backed market intelligence, not a guaranteed prediction. Figures are modeled estimates from asking prices, sold comps, and public economic indicators; they can be wrong. Not financial advice.