The factory exhaust on the F66 heavily restricts the true, aggressive character of the updated turbocharged B48 engine due to strict modern regulations. Upgrading your exhaust hardware is an essential modification to unleash a deep motorsport tone while optimising gas flow for your Cooper S or JCW. Transform your sound and drastically reduce back-pressure with premium Cat-Back Exhausts, or install our emissions-compliant GPF-back exhausts for GPF-equipped cars. For track-focused owners looking for a cost-effective acoustic and flow increase, we also offer high-flowing GPF deletes to remove restrictive factory silencers.