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1999-2005
The NB is the NA Miata refined. The chassis is stiffer, the interior is slightly more civilized, and the driving dynamics remain pure and communicative. For track use, the NB1 (1999-2000) is Spec Miata eligible, making it a direct competitor to the NA. The NB2 (2001-2005) got variable valve timing, slightly revised suspension geometry, and the optional 6-speed Aisin gearbox — all improvements that make it a better pure track car if you are not restricted to Spec Miata rules. The fixed headlights reduce frontal drag compared to the NA's pop-ups, and the slightly stiffer chassis means the car responds better to suspension upgrades without needing a roll cage to tie things together. Steering feel is nearly identical to the NA — telepathic and perfectly weighted. The brake upgrade from the NA is modest but meaningful; the NB handles 20-minute sessions at most tracks without significant fade when running quality pads and fresh fluid. The NB is about 100-150 lbs heavier than the NA, which is noticeable but not transformative. Where you really feel the difference is in the slightly more refined interior — less rattling, better sealing, and marginally more comfortable seats (though they still need replacing for track use).
Everything said about the NA being slow applies here too, with the added annoyance that the NB is slightly heavier. The styling is less iconic than the NA — the fixed headlights and softer lines do not turn heads the same way. The NB2's VVT engine, while better for track use, disqualifies the car from Spec Miata if you ever want to race in the biggest amateur class in America. And at this age (20+ years old), every NB has some combination of worn bushings, tired suspension, and electrical gremlins that need sorting before you can track it confidently.
Baseline safety and brake prep to survive your first track day without drama.
Modifications
Total Estimate
$500 – $1.5K
Master braking, throttle, and steering inputs for your Mazda MX-5 Miata.