Mini (Mk3) Cooper S / JCW (F56) 3" Valved Cat Back Performance Exhaust

Switchable 3 inch system for MINI Mk3 F56 Cooper S and JCW

Give your F56 the soundtrack it deserves with a valve-controlled rear section upgrade engineered for the MINI Cooper S and John Cooper Works. Built from premium T304 stainless steel with 76.2 mm mandrel-bent pipework and precision TIG welds, this UK-made system delivers a deeper, sharper tone and sharper throttle response while keeping day-to-day refinement when you want it.

Why owners choose this upgrade

• Wireless valve control - switch from refined to aggressive at the touch of the supplied key fob
• Two sound profiles - resonated for subtle sporty driving, non-resonated for a louder, more exciting note
• Measured sound on track test at 4,000 rpm: 92.4 dB valve open and 88.1 dB valve closed
• Direct fit from behind the catalytic converter - replaces centre section and rear silencer
• Optimised gas flow from 3 inch tubing for improved performance potential
• Choice of tips - carbon fibre or black ceramic coated options available
• All required clamps, gaskets and fittings included for a straightforward install
• Designed and manufactured in Sheffield, UK

Sound options explained

Resonated setup - includes a centre silencer for a refined, drone-controlled soundtrack on the motorway with a sporty note under load.
Non-resonated setup - removes the centre silencer for maximum presence, more burbles, pops and sharper character.

Valve control, your way

Open the valve for a louder, deeper tone and more audible pops and bangs on spirited drives. Close it for neighbourhood-friendly cruising. The supplied remote makes it effortless to tailor the sound to the moment.

Build quality you can trust

Crafted from high grade T304 stainless steel with mandrel bends and TIG welding for strength, longevity and a clean finish. This is a high quality UK-made upgrade that looks as good as it sounds.

Upgrade path

This rear section can be paired with a high-flow sports catalyst or a de-cat front pipe to create a full turbo back setup for track use. With suitable software and supporting hardware, this lays the groundwork for significant gains in power and torque.

Fitment

Designed for MINI Mk3 F56 Cooper S and F56 John Cooper Works hatchback. 3 inch 76.2 mm pipework. Catback configuration replaces the mid-pipe and backbox. Compatible with the Cobra cat back fitment option front pipe to complete the system.

What our customers say

We have installed this system for many MINI owners and the feedback has been fantastic - crisper throttle response, a richer tone, and the flexibility of quiet to loud at the press of a button. It transforms the driving experience without compromising everyday usability.

Fitting service

Want it installed professionally? Book fitting with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quote and availability.

Popular search terms

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Media

MINI Cooper S F56 Valve-Controlled System - Resonated catback with sports cat front pipe

VLOG - MINI Cooper S F56 Valve-Controlled System - Resonated catback with sports cat front pipe