Milltek Sport Cat-Back Exhaust for BMW 428i F32 Coupe (2014-2020) - 435i-Style Dual Outlet, Non-Resonated (Louder), Cerakote Black Tips - N20 Automatic, No Tow Bar - Requires 435i M Sport Rear Valance - SSXBM1014

SSXBM1014 Performance Exhaust Upgrade for BMW F32 428i Coupe

Unlock a sharper soundtrack and a premium twin-exit look for your 4 Series with the Milltek Sport stainless steel rear system. This non-resonated setup brings a more aggressive tone, faster flow and a purposeful dual tailpipe layout that mirrors the 435 look, finished with stealthy Cerakote black tips. Built in the UK from T304 aircraft-grade stainless, it is engineered for longevity, precision fitment and everyday usability.

We run this system on customer cars and it is a firm favourite. Feedback highlights crisp throttle response, a deeper note on acceleration and minimal cabin boom on the motorway. If you want a quality upgrade that transforms character without compromising refinement, this is the one.

Highlights

• Twin exit conversion for a clean OEM plus appearance that matches the 435 style diffuser
• Non-resonated layout for a louder, sportier tone with real presence
• Black ceramic coated tailpipes for a subtle, heat resistant finish
• UK made T304 stainless steel for corrosion resistance and durability
• Mandrel bent pipework designed for smooth gas flow and responsive performance
• Carefully balanced sound for enjoyable drive-by character with minimal interior resonance

Fitment

• Vehicle: BMW 4 Series F32 428i Coupe
• Engine: N20 2.0 turbo petrol
• Transmission: Automatic only
• Model years: 2014 to 2020
• Rear valance: Requires 435i M Sport rear valance or matching twin exit diffuser
• Tow bar: Not suitable for vehicles equipped with a towing package
• Part number: SSXBM1014

Build and finish

Milltek’s UK technicians design and hand finish each system using high quality T304 stainless throughout the silencers and pipework. Constant radius bends maintain velocity and help reduce back pressure, while the Cerakote coated tips deliver a premium stealth look that resists heat discolouration and road grime.

Sound and driveability

Non-resonated means more volume and a richer tone. Expect a deeper idle, a pronounced crackle on upshifts and a strong, motorsport inspired note under load, with a refined cruise thanks to carefully tuned silencing.

Fitting and support

Professional installation available at MJ Modifications, Warwickshire. We have fitted this system many times and know the conversion requirements inside out, including diffuser guidance and alignment. Request a fitting quote: info@mjmodifications.co.uk.

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