Our take on the classic 4 to 1 Miata header! The most bang for your buck, with all the features you need in an all stainless steel header.
Manufactured entirely from 304-stainless steel with thick flanges that will not warp like other stamped or cast flanges. Large 1.5" primaries collecting to a 2.0" OD tube via a smooth 4:1 merge.
Includes TWO O2 sensor bungs: one right after the merge, for your primary O2 sensor, and a second bung further down by the outlet flange which you can use to add an auxiliary wideband sensor, or use it when you go to the dyno for the sensor that's hooked up to the dyno, etc. All without having to weld in an extra bung later.
Manual transmission only. EGR compatible.
Gasket included for the connection to the cat pipe. You re-use your factory gasket for the engine to header connection as that is a metal sheet gasket and not a crush gasket, it is good for the lifetime of the car.
Comes with plugs loosely installed in the oxygen sensor bungs.
Does NOT fit with old hot side supercharger installs.
Note that adding any header results in an increase in the exhaust sound level on your Miata.
Includes a flex pipe section after the merge to help isolate vibration and movement between the motor and the rest of the exhaust - a RoadsterSport exclusive!