M2C Equal Length Mid Pipe (US Patent 11248511, patent pending in UK and EU) includes Active F-brace and $70 fixed price shipping in lower 48 states
PLEASE NOTE: OUR ALLOCATION OF COMPONENTS ARE DELAYED AND SUPPLIES ARE LIMITED. NOW AVAILABLE WITH CUSTOM CONNECTING PIPES FOR YOUR MPE REAR EXHAUST.
WE ARE RECOMMENDING TO OWNERS OF CARS WITH AFTER-MARKET DOWNPIPES TO USE THE RESONATED VERSION BUT WE HAVE ONLY TESTED WITH THE STOCK REAR EXHAUST AND ACTIVE VALVED EXHAUST. ON THE M2C WITH STOCK EXHAUST, THERE MAY BE SOME RASP.
WITH STOCK DOWNPIPES, THERE IS MINIMAL RASP so you may also want to opt for the RESONATED VERSION. HOWEVER IF YOU HAVE THE MPE OR CS EXHAUST, YOU SHOULD CONSIDER USING THE RESONATED VERSION - note that if you do not wish to cut your MPE connecting pipes, you cannot use the resonated version but can purchase special MPE connecting pipes instead.
WE DO NOT GUARANTEE RESULTS WITH OTHER MAKES OF REAR EXHAUSTS.
***Before your order ships you MUST sign and return the Off Road Use Only Waiver available HERE. Please email, fax or take a photo of the completed form. You can email it to your sales rep or to firstname.lastname@example.org and you can fax it to us at (305) 253-8921***
Active Autowerke has been an industry leader in engineering high quality BMW performance products for over 41 years. Dedicated to improving enjoyment of your driving machine with the highest quality products, Active Autowerke has been recognized as the leading BMW innovator. Our philosophy on developing refined BMW performance parts and making them available to the larger BMW community is highlighted by our most recent R&D program focused on improving the sound of the S55 exhaust. This R&D has resulted in the development of the Active Autowerke F87 M2C and M2CS equal length mid-pipe (US Patent 11248511, patent pending in UK and EU) the other option to our world famous F8X single mid-pipe.
An inline 6 engine naturally has an evenly spaced exhaust pulse which results in a more smooth and full sounding noise. However, the twin turbo setup of the S55 engine while producing addition power has created a sound which sounds more like 2 independent inline 3's competing for noise than the throaty sound one would expect. The variance between the lengths of the front and rear down-pipes of almost a foot and a half creates unevenly spaced pulses so that when the merge in any form of crossover system whether stock, x-pipes, double x-pipes, single mid-pipe or rear-section solutions. Since the sound waves are moving at the same rate when they exit the system, these crossover sections are simply creating a higher pitched sound resulting in the annoying sound some have referred to as a weed eater sound. The current systems allow the banks to merge unequally pulsed sounds and after much research and testing (from many BMW experts) it was determined that equalizing the length of the exhaust pipes before mixing was a solution to this sound problem.
Initial exhaust solutions focused on correcting this variance in the space behind the differential housing with one complaint being the inability to keep existing rear exhaust systems. Active Autowerke decided to leverage our expertise in having already developed a single mid-pipe system for the F-series M cars and devoted our R&D resources into developing the mid-pipe solution which you see here. Our R&D looked at the ways this could be done and while making up the difference in the rear section of the exhaust seemed like the most logical place, it would require a brand new rear exhaust system and we were aware that many BMW owners would not like this option. So we looked at adding length to the passenger side midpipe section and creating a new crossover section to create an exhaust note that's never been akin to the "S55 sound". Using a patented solution of a crossover with sinusoidal pipes allowed us to correct the downpipe length variance before mixing the sounds giving the expected 6 cylinder sports car exhaust notes.
The Active Autowerke M2C and M2CS Equal Length Mid Pipe was specifically designed to create equal length exhaust pipes adjusting for the difference between the front and rear banks of the F87 S55 down pipes before mixing in an X-pipe and creating an exhaust note different from the normal "S55 sound". Engineered for an exact fit on both the F87 M2C and M2CS, the difference in sound with this mid pipe will be noticeable the first time with an open throttle!
PLEASE NOTE: IT IS STRONGLY RECOMMENDED THAT CARS WITH CATLESS (STRAIGHT-THROUGH) DOWNPIPES USE THE RESONATOR OPTION FOR THE EQUAL LENGTH MIDPIPE.
- Lighter weight than factory system
- Quicker turbo spool
- Increased low end and mid-range power
- Equal length design eliminates the pulsing sound caused by the unequal length down pipes