Milltek Sport Cat-Back Exhaust for BMW 4 Series F32 428i Coupe (N20, Manual) 20142020 435i-Style Dual-Exit Conversion, Non-Resonated, Polished Tips Requires 435i M Sport Rear Valance Not Tow Bar Compatible SSXBM1005

Milltek SSXBM1005 - Twin Exit Performance System for BMW F32 428i Coupe

Transform the look and sound of your 4 Series with Milltek’s UK-built stainless steel rear section upgrade. This twin outlet conversion brings the desirable 435 style to the F32 428i, delivering a sharper, more purposeful soundtrack and a premium mirror-finish tailpipe set that truly completes the rear of the car.

Crafted from high-grade T304 stainless throughout and finished by hand in the UK, the system uses constant-radius, mandrel-bent pipework to promote smooth gas flow and a crisper throttle response. The straight-through, non-res centre arrangement increases volume for a sportier tone while keeping cabin resonance in check. It is a direct cat-back replacement that keeps the original catalytic converter in place for a clean, bolt-on upgrade.

Highlights

• Twin outlet rear conversion for the OEM-plus 435 look
• Straight-through, non-res layout for a louder, more engaging note
• Mirror polished tailpipes for a premium factory-style finish
• T304 stainless steel construction for longevity and corrosion resistance
• Mandrel-bent tubing for smooth flow and responsive performance feel
• Designed, developed and hand-finished in the UK
• Cat-back configuration retains the OE catalyst
• Part number: SSXBM1005

Fitment Information

• Vehicle: BMW 4 Series F32 428i Coupe
• Engine: N20 2.0 turbo
• Gearbox: Manual only
• Years: 2014 to 2020
• Requires 435i M Sport rear valance to complete the twin exit conversion
• Not suitable for vehicles fitted with a tow bar

Why enthusiasts choose this system

It looks right, sounds right and fits right. The dual tailpipe conversion delivers that desirable factory-plus appearance with none of the gimmicks. The tone is deeper and more assertive than stock without the droney boom you want to avoid on longer journeys. Built to last from quality materials and engineered for precise alignment, this is a proper upgrade for the N20-powered F32.

Our experience

We have installed this setup on customer cars and the feedback has been superb. Owners love the enhanced soundtrack, the crisp throttle feel that comes with improved gas flow and the way the twin outlets transform the rear end styling. It is a simple, effective way to add character to the 428i while keeping an OEM-level finish.

Professional installation

For a perfect fit and alignment, we recommend booking installation with MJ Modifications in Warwickshire. Request a fitting quote or compatibility check by emailing info@mjmodifications.co.uk.

What is included

• Complete cat back assembly for the 428i Coupe
• Straight-through centre section and twin exit rear section
• Polished stainless steel tailpipes
• All required Milltek hardware as supplied by the manufacturer

Search terms to help you find the right upgrade

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If you are aiming for a premium stainless system that adds style, sound and quality to your F32 428i, the Milltek SSXBM1005 is the standout choice. Order with confidence and elevate the look and character of your BMW.