BMW M4 (F82) Coupe 3" Secondary De-Cat Bypass Performance Exhaust

Unleash the S55 soundtrack on your BMW M4 F82 Coupe with our 3 inch secondary catalytic converter delete mid-section, engineered to pair with the Cobra Sport Valved Cat-Back (BM103). Pre-PPF vehicles only.

Looking for a serious noise increase and freer breathing from your M4 without touching the primary catalysts? This catless centre section replaces the factory secondary converters with straight-through 76.2 mm T304 stainless tubing, opening up flow and delivering a deeper, angrier tone under load while remaining civil on light throttle when used with the valved rear system. It is a proven upgrade for enthusiasts who want more character from the 3.0 twin-turbo inline-six and a genuine seat-of-the-pants improvement in response.

Why enthusiasts choose this upgrade

• Noticeably louder, richer exhaust note with enhanced turbo spool and sharper throttle feel
• Free-flowing 3 inch T304 stainless construction for durability and corrosion resistance
• Designed specifically to mate to the Cobra Sport Valved Cat-Back (BM103) for seamless fitment
• Retains the OEM primary catalysts, targeting the restrictive secondary units in the mid-pipe
• Track-focused setup that transforms the character of the F82 without unnecessary drone when paired with BM103

Fitment and compatibility

• Chassis: BMW M4 Coupe F82, pre-PPF models only
• Engine: S55 3.0 twin-turbo straight-six
• Fits to: Cobra Sport Valved Cat-Back only, part number BM103
• Pipe diameter: 3 inch / 76.2 mm
• Replaces: Secondary catalytic converters (mid-section)

What you need to know

• Requires 2 x BMW gasket, part number 18307851168 – not included
• All other necessary fittings and hardware are supplied
• After removal of the factory secondary converters, an EML/check engine light may illuminate; an ECU recalibration is recommended to optimise running and power gains
• Sold for motorsport and off-road use only worldwide

Results you can feel and hear

We have installed this setup on customer cars at MJ Modifications and the feedback is consistently positive: fuller tone, crisper response and a far more engaging soundtrack when you want it, especially in the performance drive modes with the valved rear section. It is a high-impact upgrade for those who want a genuine increase in drama from the mid-pipe area without compromising the rest of the system.

Professional fitting available

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

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