Active Autowerke F8X Equal Length Mid Pipe Kit (2014+ M3 / M4) - 11-055
PLEASE NOTE: CURRENTLY IN STOCK and SHIPPiNG per NORMAL SCHEDULES. AWE and
MPE are custom orders.
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 MAAD MAXX EXHAUST. WITH STOCK DOWNPIPES, THERE IS MINIMAL RASP.
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 info@activeautowerke.com 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 F80 M3 and F82 M4 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 F8X 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 F80 M3 and F82 M4 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 F80 M3 and F82 M4, 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.
F8x Mid-Pipe to Stock BMW Rear (Resonated)
F8x Mid-Pipe to Stock BMW Rear (Non-Resonated)
F8x Mid-Pipe to Stock BMW Rear (AWE)
