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Gorgeous! Nothing comes close to our famous RoadsterSport MAX Power Header! Look at those smooth curves! Sexy all T304 polished stainless steel is formed into equal length primaries that run for max length to the flange for max power...with a lifetime warranty! Beware some other choices on the market that swap with the factory header like this one but use shorter primaries for less power and use cheap manufacturing techniques with lots of welded standard sections which compromises flow and long term reliability (which is why they won't match our warranty!)
We 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.
TWO choices on what to do with the O2 sensors with our header. Choice ONE 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. Second 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. Both choices require extension of the O2 wires and WE NOW HAVE THE OPTIONAL SHORT and LONG O2 EXTENSION CABLES ON THIS WEBSITE to make the install plug and play!
CARB NOTICE: Installing this header in the 2006 through 2013 MX5 Miata means removing the first catalytic converter which means this header will NEVER be a California street legal header, never be CARB approved (and therefore legal in California for off road use only).
BRIAN'S APPLICATION NOTES: This is THE header for peak power on the NC, proven results over and over for a decade. Our normally aspirated customers making the most power, and our supercharger customers making the most power, are all using this header (our Supercharged 2.0 2007 makes 308 hp at the wheels with THIS header, our 2.5 liter conversion 2006 makes 221 hp at the wheels with this header, see our forum project threads for dyno prints). The first converter is also a pretty good resonator so understand that installation of any non-catted header like this one will raise the exhaust sound level at least 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, and our new Helmholtz midpipe will tame the character of the sound before it reaches the SuperQ. YES, fits Manual and Auto trans, both LHD and RHD.
INSTRUCTIONS: Read full installation hints and notes in our forum Installation Instruction Section! --- CLICK HERE TO READ MORE. YES, fits both manual and automatic.
PICTURE OF FACTORY HEADER BELOW, Note the pinch point circled in red, which chokes the power this motor can otherwise make.
Customer Adam Walker in Australia
. Happy to say Australian customers can get this header from our exclusive Australian Dealer, MX5parts.com.au.