Milltek Sport Cat-Back Exhaust for BMW 4 Series F32 428i Coupe N20 (2014-2020) - 435i-Style Dual Outlet, Resonated, Polished Tips, T304 Stainless Steel - Automatic Only, No Tow Bar - Requires 435i M Sport Rear Valance - SSXBM1012

Milltek Sport Rear System for BMW F32 428i Coupe N20 - Twin Exit Conversion - Centre Silencer - Polished Tailpipes - SSXBM1012

Give your 4 Series the purposeful twin-exit look and a richer, more mature soundtrack with this Milltek Sport rear section for the BMW F32 428i N20. Finished with mirror-polished tailpipes and built from premium T304 stainless steel, SSXBM1012 delivers an OEM-plus appearance, smoother gas flow and a refined tone that is civil on the motorway yet engaging when you press on. Hand-crafted in the UK, it is a quality performance upgrade that complements the 428i perfectly.

Why enthusiasts choose it

• Twin-exit conversion that mirrors the 435i aesthetic for a clean factory-style finish
• Centre silencer for a deeper note without harsh cabin boom or unwanted drone
• Mandrel-bent pipework for consistent radius bends and improved response
• Constructed from corrosion-resistant T304 stainless steel for long-term durability
• Beautiful mirror-finish tailpipes that elevate the rear end styling
• Designed, developed and hand-finished in the UK by Milltek Sport
• Part number: SSXBM1012

Compatibility and requirements

• BMW 4 Series F32 428i Coupe with N20 engine
• Model years 2014 to 2020
• Automatic transmission vehicles only
• Vehicles without towing equipment
• Requires the 435i M Sport rear valance from BMW to accommodate the twin exits

The sound and finish your 428i deserves

This Milltek rear system adds a deeper, crisper tone that enhances the driving experience while retaining everyday comfort. The twin tailpipes fill the M Sport diffuser properly for a balanced, factory-quality appearance. Pipework diameter is optimised to support breathing without sacrificing mid-range torque, and NVH control is excellent for long-distance journeys.

Proven quality and happy owners

We have fitted and supplied this system to many 428i drivers and have used Milltek hardware on our own builds. Feedback is consistently positive on the fit, finish and sound quality, with owners praising the subtle cold start, tasteful idle and more purposeful note under load. It is a proper upgrade that looks right, sounds right and lasts.

Professional installation

Want it fitted correctly first time with the diffuser conversion handled for you? Book installation with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quote, availability and advice on sourcing the required 435i M Sport rear valance.

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Important notes

Please confirm your car is an F32 428i Coupe with the N20 engine and automatic gearbox, without a tow bar. This twin-exit layout requires the 435i M Sport rear valance to complete the install.