Note, for the best sound:

We recommenced selecting the resonated midpipe if you are using high flow or catless downpipes.

We recommend selecting the non-resonated midpipe with stock downpipes.

 

Active Autowerke has been an industry leader in engineering high quality BMW performance products for over 39 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 equal length mid-pipe (patent pending) – 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.

PLEASE NOTE: The items in this combo deal ship from two separate locations. This combo deal provides a discount on the purchase of the axle back and the midpipe. The axle back will work without the midpipe and the midpipe will work without the axle back. If you choose to cancel an item from this combo for any reason, the cost of original shipping and restocking/merchant fees may be applicable to your reimbursement. If you choose to return an item from this combo for any reason, the cost of original shipping and restocking/merchant fees may be applicable to your reimbursement and you will be responsible for the cost of return shipping.

 

KEY FEATURES

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

 

REMUS, the world market leader in sport exhaust systems presents a brand new, unique exhaust option for the F8X M3/M4.

The 5mm wider stainless steel X-pipe and connecting pipe eliminates the front silencer and secondary catalytic convertors. This deletion adds a rumble to the S55 engine and simultaneously amplifies the turbo spool to make it a distinct part of the powerful exhaust note.

The rear muffler construction is inclusive of laser-cut brackets to mount the F8X M3/M4 exhaust valves and controllers from the OEM unit. This design seamlessly integrates the F8x Sport and Sport + settings with the REMUS unit and allows for the dynamic valves to open based on engine RPM and the driver selected Sport mode setting.

The unique REMUS muffler design feeds the fully adjustable slip-on rear tips which have 4 optional designs and sizes to customize the rear aesthetic based on your specific preference. These tip designs include (4x) 102mm angled carbon fiber with titanium internals, (4x) 102mm angled chrome, (4x) 98mm non-angled black chrome with carbon insert, and (4x) non-angled stainless with carbon insert.

The system is available in an axle-back configuration which includes only the rear silencer & tips or as a full down-pipe back system inclusive of X-pipe and connecting pipe.

Aggressive sound, sportive design, and extra power. Made in Austria.

That's what the innovative hand-crafted products from REMUS stand for.

REMUS engineers tune every single exhaust model individually to the respective vehicle for optimum power and top quality fit and finish.

From development to series production, at REMUS, quality is always a top priority. Every REMUS exhaust system includes a 36 month warranty against manufacturer’s defects.

REMUS Axle-Back System with Ø 102 mm Chrome Angled Tipes

Dynamic Autowerx Turbocharger orders take 2-3 weeks to be built and shipped, but can take up to 8 weeks in rare cases. Cancellations are subject to 25% restocking fee and a 5% nonrefundable merchant fee if cancelled before the 8 week mark.