HEAR it now from the tailpipe of our ND MX5 on the dyno! This full throttle with camera right at the tailpipe so this massively exaggerates the volume but gives you good feel for the character and tone at full throttle. You are hearing ALL THREE of the following here: RoadsterSport Max Power Header, plus the RoadsterSport Midpipe and RoadsterSport SuperQ Muffler. The midpipe and muffler obviously not included with the header, sold separate on this site. ONLY SUITABLE FOR 2 LITRE CARS AND FITS RHD AND LHD.
Now details on our header and why you want it. For the FIRST TIME Mazda went with 4-2-1 factory header layout to make that fat midrange that makes the MX5 ND so quick. Many magazines get 0-60 in stock form at about 6 seconds flat, which is obviously not about the mere 155 hp that the factory rates this motor at the crank. We tested ND headers in both 4-1 layout as we have done in the past on NC generation, and 4-2-1 layout and quickly understood the factory thinking...this motor is about TORQUE, and this motor wants a 4-2-1 layout to maximise what this Skyactive motor is designed to do.
Thus, first thing to know about the Skyactiv 2.0 motor is that a highflow 4-2-1 makes the midrange as beefy as you can get it. Sadly, most folks only think HP and do not understand torque, but it is the really wide TORQUE curve of ND that makes it so quick compared to prior MX5's, and our humble opinion is that it is best to play to that strong point, give the MX5 ND Skyactiv motor what it wants!
The results of going 4-2-1 are clear in the dyno results, this is THE header for peak TORQUE on the ND with 2.0 liter motor, even more area under the curve than with the full race Global Cup Car header (see our forum for comparison of that long tube 4-1 header and this 4-2-1 design). Our Best DYNO Results with this Header plus our RoadsterSport Midpipe and RoadsterSport SuperQ Muffler.
We strongly recommend the RoadsterSport SuperQ Header version muffler with this header because it was designed to handle the sound level of the header and our standard midpipe, most other mufflers will be too loud for most folks with this header change.
Peak Below of RoadsterSport Header Installed in our ND MX5.
Our outlet is 2.5 inches. For best performance customers should match our header with our RoadsterSport midpipe and RoadsterSport SuperQ exhaust (special header version STRONGLY recommended) 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 (however doing that would mean an engine code unless you move second sensor after midpipe converter like our RoadsterSport midpipe provides plug and play).
Factory first O2 sensor is in the OEM header and stays in our header without use of extension cords. Factory second sensor in the midpipe should be moved after the factory midpipe converter to avoid an engine code (our RoadsterSport midpipe provides bung in that location for this reason). That second sensor reaches its new location without use of extension cords.
BRIAN'S APPLICATION NOTES: INSTRUCTIONS....see our installation discussion in the Instructions Section. Complete factory service manual install page with torque specs is below. Note that NO gaskets or hardware included. We assume most customers will do it right and install our RoadsterSport midpipe at the same time for best torque results and because it avoids engine codes with O2 locations before and after the midpipe converter that you can reach without use of extension cords. And you will find our midpipe includes TWO gaskets, one for exit to muffler and one for exit from this header. If you are that cheap guy that will not replace the factory midpipe then just know you are going to use again the factory ring gasket on the stock header which matches the factory midpipe flange, and you will need to weld up some O2 bungs before and after stock midpipe converter to avoid codes, and you will be choking some of the gains because stock midpipe diameter is too small. Stock gasket at the motor to header flange is stack of stainless plates, not crush gaskets, and can be used over and over without issue.