RoadsterSport MAX Power 4-1 Standard Length MX5 Stainless Steel Header

Quality header construction starts with mandrel bent 304 stainless steel TIG welded construction, making this the best ND 4 to 1 header with LIFETIME warranty! Beware the choices that are just straight pipe and sharp 90 degree bends because that's what's easy, they won't last and they won't give max performance in return for the trouble of installing them.

Yes, we make BOTH a 4-2-1 header that is ideal for midrange and street performance and this bigger 1.75" pipe 4-1 design for the track and supercharger crowd.

Saves 3 lbs compared to the factory header.
Stock header weight: 13.15 lbs
Max Power header weight: 10.1 lbs!

We strongly recommend ONLY our RoadsterSport SuperQ Header version muffler with this header because it was designed to handle the sound and drone and RASP level of the header and our standard midpipe, most other mufflers will be far too loud for with this header.

Our outlet is 2.5 inches. Intended for use with our RoadsterSport midpipe and RoadsterSport SuperQ exhaust (special header version STRONGLY recommended) so you are getting 2.5 inches of flow all the way.

Factory first O2 sensor is in the OEM header and stays in our header - included with this header is a short o2 wiring extension so that first sensor can reach the bung down below the collector. 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. Bottom line is full plug and play install... but we strongly suggest our Orange Virus or MotoEast Tune to get max torque results.

CARB NOTICE: Not CARB approved (and therefore legal in California for off road use only). Note that there are states in addition to California that now follow the California model and require CARB compliance, please check the rules of your state before ordering, in some states this setup is legal only for race cars and may never be used on public highway. Sorry, we will not ship these to residents of California.

INSTRUCTIONS.... see our installation discussion in the Instructions Section. Complete factory service manual install page with torque specs is below. Note there is ONE gasket included to mate with our RoadsterSport midpipe. We assume customers seeking maximum peak horsepower gains - which is the point of this 4-1 header design - will do it right and install our RoadsterSport midpipe at the same time for best results and because it avoids engine codes with O2 locations before and after the midpipe catalytic converter. We do not intend this header to be paired with the small diameter factory midpipe, so this header is NOT built to work with the factory midpipe. 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.