Milltek Sport Secondary Cat-Back Exhaust for BMW 135i E82 Coupe & E88 Cabriolet (N54) 2008+ | UK-Made 304 Stainless Performance System

UK-built stainless performance rear system for BMW 1 Series 135i E82 and E88 with N54 engine

Transform the character of your 1 Series 135i with this premium Milltek rear exhaust section, precision-crafted in Britain from T304 stainless steel. Designed around the twin‑turbo N54 straight‑six, it delivers a sharper throttle response, a deeper motorsport‑inspired tone and superb longevity, all while retaining everyday refinement.

What you’ll notice

• Sportier soundtrack with a clean, aggressive note under load and low cabin boom at cruising speeds
• Free‑flowing pipework and smooth radius bends to reduce back pressure and improve gas velocity
• High quality T304 stainless construction for excellent corrosion resistance and a smart, long‑lasting finish
• Tight tolerances and OE‑style hangers for a straightforward bolt‑on installation
• Engineered specifically around the E82 coupé and E88 convertible chassis for proper alignment and clearance

Why enthusiasts choose this upgrade

Milltek’s UK engineering and meticulous acoustic development give the N54‑powered 135i the sound it deserves without the unwanted drone that can plague lesser systems. We have fitted this system ourselves and our customers consistently praise the fit, tone and build quality.

Compatibility

• BMW 1 Series 135i E82 coupé, 2008 onwards, N54 twin‑turbo
• BMW 1 Series 135i E88 cabriolet, 2008 onwards, N54 twin‑turbo

Installation and support

Professional fitting recommended. MJ Modifications in Warwickshire can install this system and offer expert advice. Request a fitting quote: info@mjmodifications.co.uk.

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Ready to wake up your 135i with a stronger sound and smoother flow? Order today and enjoy proven UK craftsmanship and a rewarding drive on every journey.