Audi S4 (B8)
Given the thin data state, this market outlook for the Audi S4 (B8) is low-confidence. While appreciation momentum stands at 60.0 and liquidity at 56.88, the 6-month forecast indicates an 'up' direction with 0.47 probability, shifting to a 'down' direction with 0.52 probability over 12 and 24 months, all within a volatile regime. The strongest leading indicator is the Trade-Weighted Dollar Index, showing a 0.53 correlation at a 6-month lead.
What It's Actually Worth
Blended value of a standard 11 yr, 90k mi example, ~$15.6K 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? 51% 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 41 scored forecasts: 51% got the direction right, median value error ±17%.
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 179 past auctions in this market — predicting each hammer price from market data before the sale (no hindsight). Typical miss: ±13%; the gavel landed inside our predicted range 9 in 10 of the time, and we lean slightly high on average.
| Sold | Car | Our range | Hammer | |
|---|---|---|---|---|
| 2026-07-09 | 2010 · 128k mi | $7.6K–$16.8K | $13.3K | ✓ |
| 2026-07-07 | 2013 · 143k mi | $7.0K–$15.5K | $9.4K | ✓ |
| 2026-06-26 | 2011 · 123k mi | $7.9K–$17.4K | $12.5K | ✓ |
| 2026-06-23 | 2014 · 68k mi | $12.2K–$26.9K | $21.3K | ✓ |
| 2026-06-17 | 2014 · 106k mi | $9.0K–$20.0K | $15.3K | ✓ |
| 2026-06-11 | 2013 · 111k mi | $8.7K–$19.2K | $11.4K | ✓ |
| 2026-06-01 | 2013 · 84k mi | $10.7K–$23.6K | $13.8K | ✓ |
| 2026-05-14 | 2016 · 42k mi | $14.2K–$31.4K | $46.3K | ✗ |
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 | 2015 | C&B | $9.4K–$26.4K ($15.7K) |
| open | 2012 · 126k mi | classic | $6.8K–$19.1K ($11.4K) |
| open | 2014 · 83k mi | classic | $9.4K–$26.5K ($15.8K) |
| open | 2013 · 144k mi | classic | $6.1K–$17.2K ($10.3K) |
| open | 2011 · 196k mi | classic | $5.6K–$15.8K ($9.4K) |
| open | 2012 · 66k mi | classic | $10.8K–$30.4K ($18.1K) |
| open | 2014 · 87k mi | classic | $9.2K–$25.9K ($15.5K) |
| open | 2015 · 89k mi | classic | $9.1K–$25.6K ($15.3K) |
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 | 47% | Low | 64% |
| 12 mo | DOWN | 52% | Low | 51% |
| 24 mo | DOWN | 52% | Low | 48% |
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. S&P 500 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 higher over the next ~12 months (moderate conviction — 52% of weighted drivers agree), driven mainly by S&P 500 and Ethereum (USD), though Trade-Weighted Dollar Index 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 2021
$100K invested 2021-04 → today (5.3 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.
S&P 500 leads by about 11 months (moves with this market, correlation 0.49). Shown shifted forward 11 months so its turns line up with the market's.
Why We Think This
Current Inventory Snapshot
Comparable Markets
| Market | Undervaluation | Appreciation | Liquidity |
|---|---|---|---|
| BMW 1M Coupe (E82) | 17 | 68 | 61 |
| Nissan 350Z | 43 | 68 | 50 |
| Nissan 350Z NISMO | 29 | 55 | 57 |
| Nissan 370Z | 50 | 45 | 50 |
| Alfa Romeo 4C | 54 | 40 | 45 |
| Fiat 500 (2012-2019) | 36 | 58 | 45 |
| Porsche 718 Boxster/Cayman | 44 | 37 | 36 |
| Porsche 718 Boxster/Cayman GT4 | 17 | 38 | 30 |
Recent Signals & Alerts
- vin returned lower VIN relisted $-2,500 vs prior
- vin returned higher VIN relisted +$13,095 vs prior
- undisclosed title change VIN previously reported non-clean now listed clean/undisclosed
- vin returned higher VIN relisted +$13,095 vs prior
- vin returned lower VIN relisted $-2,500 vs prior
- undisclosed title change VIN previously reported non-clean now listed clean/undisclosed
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.