The famous RoadsterSport MAX Power Header...now with MONSTER 1.875 inch primaries 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!
They have included a number of features into their MX5 Miata header which they believe customers will appreciate. CNC machine'd the main flange to match the factory unit, including the bolt hole flange area thicknesses so that they are precisely replicating the factory fit to the head in terms of thread depth and space, etc. They also put incredible effort into making the exit at the collector as smooth and perfect as they could get it because this collection point is the KEY to good header flow and had to make sure this was done as perfect as possible. Note they use the factory collector gasket....so our fit is as factory-like as possible.
The collector outlet is 2.5 inches. For best performance customers should match the header with our offered 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.
Several options on what to do with the O2 sensors with our header. Choice ONE is buy the midpipe and extensions (the plug and play choice). The midpipes are designed to take both O2 sensors (buy BOTH extensions)...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 also 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 (sensors will reach header connection but you may have to follow their wires back to the harness and use a razor blade to clear some sheath which has them gathered shorter than they actually are).