Active Autowerke Resonated Single Midpipe for BMW M3 F80 & M4 F82 (F8X S55) - 3.5in Oval Centre/Center Exhaust Section Link Pipe - Deeper Tone, Less Drone, Rasp Fix, Quicker Spool - Performance Mid Section Upgrade - AA P/N 11-037

Active Autowerke F8X Centre Section - Resonated Single 3.5 inch Oval

Transform the soundtrack and response of your S55-powered BMW with the Active Autowerke resonated centre section. Purpose-built for the BMW F80 M3 saloon and F82 M4 coupe, this single oval 3.5 inch middle section and its resonated connectors smooth out exhaust pulses, cut back pressure and replace the thin, buzzy strimmer-like note with a richer, deeper tone that still stays civil on the motorway.

Looking for a UK-supplied M3 or M4 centre pipe upgrade that reduces drone, improves turbo spool and adds a premium note without fuss? This is the proven F8X mid section that delivers real-world gains and everyday refinement.

Key reasons enthusiasts choose this F8X centre section

• Dyno-verified improvements - 18+ wheel horsepower and 30+ lb ft recorded in testing*
• Lower restriction for sharper throttle response and quicker turbo acceleration
• Resonated connector pipes tame cabin boom while enhancing a deeper character
• Single-tube design for optimal flow and reduced weight versus the factory multi-box layout
• Oval 3.5 inch tubing maintains performance diameter while protecting ground clearance
• Noticeable boost in low and mid-range pull on the road
• Direct fit for BMW F80 M3 and F82 M4 on the F8X platform

Engineering that fixes the F8X rasp

The stock middle section uses multiple chambers and a tiny internal crossover that disrupts gas speed and exaggerates uneven turbo pulses. Active Autowerke’s single-path solution aligns those pulses, smooths flow and unlocks a fuller M-car soundtrack. The ovalised 3.5 inch tube keeps the ideal cross sectional area for performance while offering better clearance for British roads and speed humps.

Proven on the dyno and on the road

Mustang Dyno results

Tested with the Active Autowerke F8X mid section and Active Autowerke rear section:

• Stock: 380 WHP | 371 WTQ
• Full Active Autowerke Exhaust: 398 WHP | 401 WTQ
• Full Active Autowerke Exhaust Run 2: 397 WHP | 398 WTQ

Expect a crisper hit of torque and a cleaner surge through the revs as soon as it is fitted.

Our experience

We have installed this centre section on multiple customer builds at MJ Modifications and the feedback has been consistently excellent. Owners love the deeper, higher-quality note, the reduced cabin hum at cruising speeds and the noticeably quicker spool. It makes the S55 feel more alive without sacrificing day-to-day usability.

Installation and support

Professional fitting is recommended. Book installation at MJ Modifications in Warwickshire - request a quote via info@mjmodifications.co.uk.

Part number

P/N: 11-037

Fitment

• BMW F80 M3 - S55
• BMW F82 M4 - S55

Media

Important note

Active Autowerke full exhaust system is recommended for, but not limited to, off-road or racing applications.

Search terms customers use

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*Gains may vary based on vehicle condition, supporting modifications and fuel.