Mazdaspeed Miata (NB turbo)
Flagged undervalued because inventory -1%, sell-through 98%, asking -4% vs historic sold, and +0% vs 3-yr trend.
What It's Actually Worth
Blended value of a standard 21 yr, 51k mi example, ~$14.8K 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? 44% 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 36 scored forecasts: 44% got the direction right, median value error ±27%.
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 122 past auctions in this market — predicting each hammer price from market data before the sale (no hindsight). Typical miss: ±16%; 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 | |
|---|---|---|---|---|
| 2026-08-28 | 2004 · 16k mi | $11.2K–$25.1K | $20.0K | ✓ |
| 2026-08-21 | 2004 · 67k mi | $8.9K–$19.9K | $10.8K | ✓ |
| 2026-08-19 | 2004 · 33k mi | $10.3K–$23.0K | $16.5K | ✓ |
| 2026-08-10 | 2005 · 33k mi | $10.3K–$23.0K | $22.5K | ✓ |
| 2026-07-31 | 2004 · 21k mi | $11.2K–$25.1K | $21.5K | ✓ |
| 2026-07-29 | 2004 · 53k mi | $9.8K–$21.9K | $15.7K | ✓ |
| 2026-07-27 | 2005 · 16k mi | $11.4K–$25.4K | $18.8K | ✓ |
| 2026-06-04 | 2004 · 140k mi | $7.1K–$15.9K | $8.7K | ✓ |
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 | 2005 | C&B | $8.8K–$25.1K ($14.9K) |
| open | 2004 · 90k mi | classic | $6.9K–$19.3K ($11.5K) |
| open | 2005 · 41k mi | classic | $7.9K–$25.3K ($14.1K) |
| open | 2004 · 141k mi | classic | $5.4K–$17.3K ($9.6K) |
| open | 2004 · 62k mi | classic | $7.6K–$24.5K ($13.7K) |
| open | 2004 · 96k mi | classic | $5.9K–$18.9K ($10.6K) |
| open | 2004 · 31k mi | classic | $8.3K–$26.5K ($14.8K) |
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 | 57% | Low | 38% |
| 12 mo | DOWN | 58% | Low | 44% |
| 24 mo | DOWN | 61% | Low | 54% |
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. Advance Retail Sales has historically led it by about 9 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 (high conviction — 100% of weighted drivers agree), driven mainly by Advance Retail Sales and Consumer Discretionary ETF (XLY).
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 (5.4 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.
Effective Fed Funds Rate leads by about 12 months (moves against this market, correlation 0.82). 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 |
|---|---|---|---|
| BMW 1M Coupe (E82) | 44 | 44 | 57 |
| Nissan 350Z | 55 | 53 | 53 |
| Nissan 350Z NISMO | 51 | 9 | 56 |
| Nissan 370Z | 50 | 45 | 46 |
| Alfa Romeo 4C | 50 | 49 | 39 |
| Fiat 500 (2012-2019) | 66 | 29 | 48 |
| Porsche 718 Boxster/Cayman | 47 | 47 | 39 |
| Porsche 718 Boxster/Cayman GT4 | 19 | 42 | 41 |
Recent Signals & Alerts
- vin returned higher VIN relisted +$3,295 vs prior
- vin returned higher VIN relisted +$3,295 vs prior
- vin returned higher VIN relisted +$4,295 vs prior
- vin returned higher VIN relisted +$4,295 vs prior
- vin returned higher VIN relisted +$4,295 vs prior
- vin returned higher VIN relisted +$4,295 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.