BMW 425D (F32/F33/F36) Quad Exit M4 Style Performance Exhaust Conversion

Give your 4 Series diesel a serious visual upgrade with this UK made quad tailpipe rear section and matching diffuser panel. Built from premium T304 stainless steel with precision TIG welds and smooth mandrel bends, this axle back conversion delivers a sharper, sportier look with a refined tone that stays close to factory volume for effortless daily driving.

Why choose this quad tailpipe setup

• M inspired look with four slash cut tips, twin outlets each side for a balanced, aggressive rear end
• High grade T304 stainless construction for long term durability and corrosion resistance
• 63.5 mm 2.5 inch pipework for efficient flow on standard and remapped cars
• Subtle sound enhancement, minimal cabin boom, ideal for motorway use
• Designed and crafted in the UK by Cobra Sport with beautiful TIG welded joints
• Supplied with a quad outlet lower rear valance to finish the conversion properly

Compatibility

• BMW 4 Series 425d B47 diesel engine
• F32 Coupe, F33 Convertible, F36 Gran Coupe including LCI facelift
• M Sport rear bumper required
• Works with cars equipped with the factory tow bar
• Not suitable for AdBlue equipped models

What you get

• Centre to rear axle back system with quad outlets
• Interchangeable quad exit lower rear panel diffuser
• All required fittings and gaskets for installation

Fitting information

• The original exhaust pipework requires a cut to install this system
• Professional installation recommended for best alignment and tip positioning
• We offer full fitting at MJ Modifications, Warwickshire. Request a quote at info@mjmodifications.co.uk

Real world benefits

• Transforms the rear view with a genuine quad look that complements the M Sport styling
• Ideal partner for tuned software on the B47, with smart flow and OEM+ manners
• Quality you can trust from a long established British exhaust specialist

We have fitted this conversion for customers and on our own builds. Feedback has been overwhelmingly positive, praising the fit, finish and the tasteful, refined soundtrack that avoids unwanted drone while adding a purposeful note.

Search friendly highlights

BMW 4 Series 425d quad exhaust kit, F32 F33 F36 quad tip rear section, M look diffuser valance, B47 diesel axle back upgrade, four tailpipe conversion for M Sport bumper, UK made stainless system, subtle sound OE level volume, compatible with tow bar, not for AdBlue.

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