Active Autowerke Equal Length Resonated Midpipe/X-Pipe – BMW M3 M4 F8X (F80 F82 F83) S55 Exhaust Center/Centre Pipe, Rasp Delete Mid Section, 2015–2020

Transform your BMW M3/M4 soundtrack and response

Looking for a smoother, deeper straight‑six note on your F8x without swapping your back box? This resonated equalised‑length centre section from Active Autowerke rebalances the S55’s uneven bank lengths before the X merge, delivering the rich inline‑six character enthusiasts want and toning down that metallic rasp. Sharper boost response and stronger pull through the lower and middle revs make it a brilliant road and track upgrade.

Why owners choose this centre section

• Eliminates the tinny S55 rasp for a cleaner, fuller six‑cylinder tone
• Helps the turbos come on song sooner for crisper throttle response
• Improved low‑to‑midrange urgency for real‑world driving and track days
• Direct bolt‑on midsection that keeps your existing rear silencer/back box
• T304 stainless throughout with precision TIG welds for durability and a premium finish
• Innovative crossover with sinusoidal runners to synchronise bank lengths before the X merge
• Resonated version is ideal for cars on decat downpipes to keep volume and harshness in check
• Patent‑pending design

Fitment

• BMW M3 saloon F80: 2015–2020
• BMW M4 coupé F82: 2015–2020

Compatibility

• Pairs with most F8x axle‑back systems and OEM‑style rear sections
• Designed to suit stock or aftermarket downpipes
• Resonated centre is strongly recommended when running catless downpipes

What you can expect

A balanced exhaust pulse sequence brings back the classic straight‑six character while keeping the car civilised on the motorway. Our team has run this setup and customer feedback on tone, refinement and build quality has been excellent. It sounds right, pulls harder where it matters and fits like a quality part should.

Ideal search terms for this product

BMW M3 exhaust upgrade, BMW M4 centre pipe, F80 exhaust middle section, F82 rasp fix, S55 rasp delete, equalised length centre, resonated midsection, X‑section crossover, performance exhaust UK, BMW M3 M4 catless friendly centre pipe, axle‑back compatible midsection, bolt‑on centre pipe F8x.

Professional fitting

Want it fitted properly first time? Book installation with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.