The most common Miata mod mistakes all share one root cause: spending on the wrong thing in the wrong order. Chasing N/A power, buying cheap coilovers, and slamming the car ruin more Miatas than they improve.
Every experienced owner has watched a newcomer make the same handful of errors. Save yourself the money.
- Chasing naturally-aspirated bolt-on power. Intake, header, and exhaust net almost nothing for real money. If you want power, boost it. If you want sound, fine, but know that's what you're buying.
- Buying the cheapest coilovers. Bargain coilovers ride worse than good springs on good shocks. Either buy quality (Xida and the like) or run a proper shock/spring kit. Don't buy junk with knobs.
- Slamming the car. Excess lowering wrecks the factory geometry (bump steer, roll-center issues) and the ride, and it makes the car slower. A modest drop is faster and rides better.
- Harness without a roll bar. A dangerous mistake, covered elsewhere: never run a competition harness without a proper bar and head-and-neck protection.
- Skipping the alignment. New suspension without an alignment leaves lap time and tires on the table. Always align after suspension work.
- Ignoring the tired chassis. Dropping shiny parts onto 30-year-old bushings and cracked frame rails. Refresh the foundation first.
- Wheels too big and heavy. Chasing 17s for looks adds unsprung weight and costs grip. Light 15s are faster and cheaper.
- Power before tires and brakes. More power a car can't put down or stop is just more danger.
The fix is a mindset: this is a handling car. Spend on tires, brakes, a healthy chassis, good suspension, safety, and seat time, in that order, and add power last and via boost. Do that and you'll have a genuinely great car instead of an expensive lesson.