RoadsterSport All Stainless Steel MX5 Miata Header :: 06-12

We have included a number of features into our MX5 Miata 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.

We also put incredible effort into making the exit at the collector as smooth and perfect as we can get it because this collection point is the KEY to good header flow and we had to make sure this was done as perfect as possible. Note we use the factory collector gasket....so our fit is as factory-like as possible.

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 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. Note that we have no O2 sensor connection in our header....in part to keep flow as clean as we can get it but also because we could see no purpose in locating them in the header since doing so will throw a code because pulling the factory header includes removal of the first catalytic converter.

THREE choices on what to do with the O2 sensors with our header. Choice ONE is to simply open air mount them in the engine bay (or unplug and remove them) and they will throw the same codes in the same manner as if they were in the header. Second and better choice is buy our midpipe which is designed to take both O2 sensors...and includes two O2 sensor connections...one before the midpipe's converter and one after the midpipe's converter to help avoid a code by simulating the factory installation before. Third choice is to have an O2 bung welded by your local muffler shop before and after the factory second converter in the factory midpipe to replicate the setup we are doing with our midpipe. Choices two and three require extension of the O2 wires and WE NOW HAVE THE OPTIONAL SHORT and LONG O2 EXTENSION CABLES ON THIS WEBSITE.

CARB NOTICE: Installing a header in the new 2006 through 2012 Miata means removing the first catalytic converter which means there can NEVER be a street legal header for this vehicle. Thus, the header is legal for offroad race use only, and can NEVER be CARB approved.

BRIAN'S APPLICATION NOTES: This is THE header for peak power on the NC. Our normally aspirated customers making the most power, and our supercharger customers making the most power, are all using this header. The first converter is also a pretty good resonator so understand that installation of any header will raise the exhaust sound level about 20%. Therefore, we strongly recommend the RoadsterSport Q muffler with any header change because it was designed to handle the sound level of the header. Those with AUTOMATIC transmission should read our instructions on install first.

INSTRUCTIONS....see complete installation instructions in our forum in the Instructions Section.

SOUND Files and DYNO at our Exhaust Blog---CLICK HERE TO LISTEN AND READ MORE."

PICTURE OF FACTORY HEADER BELOW, Note the pinch point circled in red, which chokes the power this motor can otherwise make.