Goodwin Racing RoadsterSport Street Catted Header - NC

PLUG AND PLAY RoadsterSport Street catted header, all sensors stay in factory locations! This is the most torque you can buy in a catted MX5 Miata header. All Stainless Steel and proudly made here in the USA. See our forum MX5 PRHT Project and Dyno thread for many more details on development history, pictures of prototypes, and dyno work. A great choice for street customers looking for a Plug And Play MX5 Miata header with converter that is 49 state legal! Sorry, we cannot ship these to residents of California.

MX5 Miata Street Header features:
-Longer, equal length runners
-High-flow 5" round, 200cpi Ceramic Core Catalytic Converter
-49 state legal cat (EPA and OBD2 compliant, but NOT CARB APPROVED for California, the Carsound 99659HM core is an EPA certified converter covering up-to 6.2L/6375 lbs so it easily handles the flow of our performance header. But not CARB approved so it is not legal for street and/or highway driving in California.
-Bolt-in design for MANUAL TRANSMISSION (see our forum header install thread for details of installation on automatic transmission). 
-Bolts to RoadsterSport MX5 Midpipe...or stock MX5 midpipe. Also saves weight, factory header assembly is 15.2 pounds and this RoadsterSport MX5 Street Header with converter is just 11 pounds! Converter has two year manufacturing defect warranty (normally aspirated cars only, NOT recommended for supercharged cars or heavy autocross/track use), the rest is all stainless steel and has a LIFETIME warranty, even the flanges!

Currently for Manual Transmission only (a professional can install on the automatic but it requires re-engineering the cooling line layout and modification to the bell housing). Also, sorry to our Australian customers but this fits Left Hand Drive only.

We have included a number of extra features into our MX5 Miata Street Header which we believe customers will appreciate. We CNC machine the main flange to match the factory unit, including the bolt hole flange area thicknesses so that we are precisely replicating the factory fit to the head in terms of thread depth and space, etc.

Our collector outlet is 2.5 inches. Curiously, the factory outlet is ALSO 2.5 inches and then the factory exhaust chokes down after that point. For best HIGH RPM performance customers should match our header with our midpipe and exhaust so they are running 2.5 inches of flow all the way...but our header will bolt in place of the factory header and connect perfectly to the factory midpipe for better performance from idle to redline.