Active Autowerke Equal Length Midpipe Non Resonated X-Pipe for BMW M3/M4 F80 F82 (2015-2020) S55 Rasp Fix Centre/Center Mid Pipe Exhaust Upgrade, Bolt-On T304 Stainless F8X

Transform the soundtrack and response of your BMW M3 or M4

Looking for a deeper, smoother straight-six note without the tinny edge commonly heard on turbocharged S55-powered cars? This equal-length centre section with X-pipe delivers a richer tone, cleaner pulses and sharper throttle feel. The non-resonated configuration adds volume and character while keeping things refined for road and track use.

Why enthusiasts choose this centre section

• Eliminates the metallic rasp that plagues many S55 exhaust setups, replacing it with a mature, motorsport-inspired sound.
• Improves turbo response for stronger low and mid-range punch, helping your M carve out of corners and surge through the revs.
• Pairs with most axle-back systems and popular back boxes, so you can keep your preferred rear section.
• Patent pending crossover with sinusoidal routing equalises primary lengths before the X merge for that classic inline-six timbre.
• Constructed from 100% T304 stainless with precision TIG welding for durability and corrosion resistance.

Engineered for the S55, tuned for tone

The twin-turbo straight-six in the F80 and F82 has uneven downpipe lengths between the front and rear banks, which disrupts pulse timing when gases mix too early. This mid-section corrects that length variance before the merge, then blends flow via an X-pipe to restore the smooth, full-bodied six-cylinder character enthusiasts want. The result is a deeper exhaust note, more linear sound under load and crisper transient response.

Compatibility

• BMW M3 Saloon F80 2015 to 2020
• BMW M4 Coupe F82 2015 to 2020

Compatible with the majority of axle-back rear sections, OE and aftermarket. Non-resonated specification for maximum presence.

Specification highlights

• Material: T304 stainless steel
• Welding: TIG-welded throughout
• Design: Equal-length centre section with X-pipe - patent pending
• Fitment: Direct bolt-on, designed for exact fit on F80 and F82 platforms

Real-world results

We have fitted and run this mid-section on our own builds and for customer cars. Feedback is consistent - cleaner tone, less rasp, more presence and a noticeably quicker pick-up through the mid-range. It is a go-to exhaust upgrade for anyone chasing the perfect M-car soundtrack.

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Fitting and support

Professional installation recommended. MJ Modifications in Warwickshire can supply and fit - request a quote at info@mjmodifications.co.uk.

Notes

Running de-cat downpipes or a very free-flowing front section? Consider the resonated version to further control volume. This listing is for the non-resonated centre section.