Audi S4 (B6)
Given the thin data state, this low-confidence read for the Audi S4 (B6) market signals a downward direction over the next 6 to 24 months, with probabilities from 0.54 to 0.57. This volatile market shows high overvaluation at 68.96 and low liquidity at 27.66, with the Case-Shiller National Home Price index serving as the strongest leading indicator at a -0.76 correlation.
What It's Actually Worth
Blended value of a standard 20 yr, 91k mi example, ~$10.3K 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? 56% 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 48 scored forecasts: 56% got the direction right, median value error ±40%.
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 5 in 10
We replayed 97 past auctions in this market — predicting each hammer price from market data before the sale (no hindsight). Typical miss: ±35%; the gavel landed inside our predicted range 5 in 10 of the time.
| Sold | Car | Our range | Hammer | |
|---|---|---|---|---|
| 2026-06-23 | 2004 · 92k mi | $6.9K–$15.3K | $14.5K | ✓ |
| 2026-06-19 | 2004 · 131k mi | $6.0K–$13.2K | $6.8K | ✓ |
| 2026-05-22 | 2004 · 47k mi | $8.7K–$19.2K | $11.0K | ✓ |
| 2026-05-20 | 2004 · 117k mi | $6.4K–$14.2K | $14.4K | ✗ |
| 2026-05-01 | 2005 · 144k mi | $5.9K–$13.0K | $3.1K | ✗ |
| 2026-03-30 | 2005 · 97k mi | $6.8K–$15.1K | $12.0K | ✓ |
| 2026-01-28 | 2005 · 36k mi | $8.8K–$19.4K | $14.0K | ✓ |
| 2025-12-15 | 2005 · 117k mi | $6.1K–$13.4K | $12.0K | ✓ |
Live now — calling it before the gavel
We're currently tracking 7 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 | 2004 · 137k mi | ebay | $4.7K–$13.4K ($7.9K) |
| open | 2004 | C&B | $6.1K–$17.2K ($10.3K) |
| open | 2005 · 47k mi | classic | $7.0K–$19.6K ($11.7K) |
| open | 2005 | classic | $6.7K–$18.8K ($11.2K) |
| open | 2005 · 138k mi | classic | $4.7K–$15.0K ($8.4K) |
| open | 2005 · 111k mi | classic | $5.4K–$17.3K ($9.7K) |
| open | 2005 · 103k mi | classic | $5.6K–$18.0K ($10.0K) |
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 | DOWN | 54% | Low | 56% |
| 12 mo | DOWN | 56% | Low | 56% |
| 24 mo | DOWN | 57% | Low | 75% |
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.
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 (high conviction — 76% of weighted drivers agree), driven mainly by Effective Fed Funds Rate and M2 Money Supply, though Dow Jones Industrial 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 2014
$100K invested 2014-01 → today (12.6 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.
Case-Shiller National Home Price leads by about 0 months (moves against this market, correlation 0.72). Shown shifted forward 0 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 higher VIN relisted +$4,200 vs prior
- vin returned higher VIN relisted +$4,200 vs prior
- vin returned higher VIN relisted +$3,000 vs prior
- vin returned higher VIN relisted +$4,500 vs prior
- vin returned higher VIN relisted +$3,000 vs prior
- vin returned higher VIN relisted +$4,500 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.