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Our famous RoadsterSport MAX Power Header...now with MONSTER 1.875 inch primaries AND BRIGHT ceramic coating for customers with 2.5 liter conversions and supercharged 2.0 liter motors!
Look at those smooth curves! Notice you don't see 6 welded sections for each primary like so many lesser headers that are made from cut pieces of standard radius pipe and straights. Instead, where possible ultra SMOOTH all mandrel bent tube is used here to keep flow as clean as possible. Sexy all T304 polished stainless steel is formed into massive 1.8 inch primaries for max power...with a lifetime 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. 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.
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 (and this setup keeps flow as clean as possible in the critical collector). Second choice is to put BOTH sensors in the header, which will cause a code unless your tuner turns off the code caused by having the second sensor in the header. Third choice is first sensor in the header and second sensor in our midpipe after the converter, which will avoid a code. For install in the midpipe of both sensors you need both O2 extension cords, if you put first sensor in the header you only need extension for the second sensor, put both sensors in the header and you don't need any extension cords but do need your Tuner to shut off code from second sensor.
NOTES ON CERAMIC COATING. Frankly, it is usually only the mild steel headers that are ceramic coated and I had always suspected that the main reason was to slow down the inevitable rust that a mild steel header will suffer over time. Since this header is already made in ALL STAINLESS STEEL, it does not need ceramic coating for rust prevention. That left the pure question of whether or not we could really find additional torque with the ceramic coating to justify the costs. After lots of testing the answer turned out to be YES, our BRIGHT ceramic coating was consistently ~3% stronger across all points on the curve.
CARB NOTICE: Installing this header in the 2006 through 2015 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). Sorry, we will not ship these to residents of California.
BRIAN'S APPLICATION NOTES: This is THE header for peak power on the NC with 2.0 and supercharger or 2.5 liter conversion. It is a bit big for normal street driven 2.0 liter motor, using it on regular 2.0 street driven car will shift the torque curve higher, thus we usually suggest our standard 1.6 inch primary version for normal street driven 2.0 installs. But if racing or planning a supercharger down the road, go big 1.8 inch from the start!
The first converter is also a pretty good resonator so understand that installation of any header will raise the exhaust sound level a good 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 RoadsterSport Helmholtz midpipe tunes the final sound result for drone free fun.
YES this header fits with the automatic transmission with a bit of grinding. There is a minor clearance issue between the edge of the header's bottom flange and the auto transmission. Some grinding needs to be done to knock the corner of the flange down a hair and then everything will fit. Also does NOT fit with our 2.5 engine drop brackets.
INSTRUCTIONS: Read full installation hints and notes in our forum Installation Instruction Section! ---
Dyno shows improvement in power on our supercharged 2007 2.0 liter as compared with 1.6 inch version of same header. This was comparison purely on flow, no changes to tune. With greater flow even more timing could be added to make this difference MUCH greater.