Available Now - MINI Mk4 (F66/F67) JCW Performance Exhausts

Posted by Rohan Boparai



The MINI has been back in the workshop – and it’s not here for a quiet visit. The Cobra Sport development team have been busy crafting something special for the brand-new JCW F66 and F67 models, and hot hatch fans are going to love this one.

Under the skin, the Mk4 JCW is packing the familiar punchy B48 engine, still putting power through the front wheels but now dressed in the latest-gen styling. It’s got the look and the attitude, but from factory, the soundtrack does nothing to match the energy. That’s where Cobra Sport step in.

As always, every system is hand-built in Sheffield by our expert fabricators using premium materials and precision TIG welding techniques. Quality, performance and sound are baked in from the first bend to the final polish.

For the JCW, the team have developed a valved secondary cat back performance exhaust system that integrates seamlessly with the MINI's factory valve setup. It stays fully MOT compliant while delivering the unmistakable Cobra Sport tone that the stock system simply can’t offer.


The system starts with a 3" (76.2mm) non-resonated centre section, giving a noticeable jump in flow compared to the restrictive stock section. Moving towards the rear, the oversized factory back box has been ditched in favour of a unique and sleek oval setup in 2.5” (63.5mm) pipework, featuring a small silencer on one side and a straight-through section on the other which houses the factory valve.

Unlike typical drive-mode-dependent valve implementations, the MINI’s valve works purely from throttle input. Push the pedal harder and the valve opens immediately, sending gases straight through for an unleashed JCW soundtrack. Ease off, and it routes back through the silencer to keep things calm in the cabin with no drone.

Round the back, the single factory tip design has been beefed up with a larger 4.5" (114.3mm) tailpipe, matching Mini’s new single-exit style. Customers can choose between three premium stainless steel finish tailpipe or go upmarket with the carbon fibre option.


The new sound is what the JCW owners will be calling out for, on throttle, it barks instantly, lift off, and it tucks itself away without fuss. Whether you're pulling away or cruising, the response is immediate and the tone is rich, sporty and refined. Compared to the standard setup, the difference in character and overall driving feel is night and day.

System Summary

  • Handcrafted in Sheffield using premium materials

  • Precision TIG-welded construction

  • Valved secondary cat back design with factory valve integration

  • 3” non-resonated centre section for improved flow

  • 2.5” oval rear section with silencer + straight-through valve path

  • No reliance on drive modes – throttle input controls everything

  • 4.5” (114.3mm) tailpipe options in stainless steel or carbon fibre finish

  • MOT compliant with a proper sound upgrade

Designed to elevate the driving experience while retaining everyday usability, the Cobra Sport cat back performance exhaust is the perfect blend of sound, style, and performance.

View more information and pricing on our product page > Mini JCW Valved Performance Exhaust Upgrade

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