Milltek Sport Large-Bore Downpipes with High-Flow Sports Cats & OPF/GPF Bypass for BMW M4 F82/F83 Coupe/Convertible & M4 Competition (OPF/GPF Only) 20192020 - SSXBM1127

SSXBM1127 High Efficiency Sport Cat Front Pipes and Particulate Filter Bypass for BMW M4 F82 F83 and M4 Competition 2019 to 2020

Transform the character of your M4 with this premium UK‑engineered front section. SSXBM1127 replaces the restrictive factory front pipes with enlarged diameter turbo downpipes featuring high efficiency sport catalytic converters and dedicated particulate filter bypass pipes. The result is faster turbo response, stronger mid‑range pull and a deeper, crisper soundtrack that enhances every drive while avoiding harsh cabin boom.

Crafted from high grade 304 stainless steel with smooth radius bends for uninterrupted gas flow, this upgrade is built for enthusiasts who want a durable, precision fit solution for OPF‑equipped cars. We run this setup on customer cars and the feedback is consistently positive on quality, fitment and sound.

Key reasons drivers choose SSXBM1127

• Enlarged diameter turbo front pipes reduce back pressure for improved throttle response and turbo spool
• High efficiency sport cats balance performance with refined tone
• Particulate filter bypass pipes for OPF‑equipped models to maximise flow and sound
• UK made 304 stainless construction for long term corrosion resistance
• Smooth, constant‑radius bends for optimal gas velocity and performance
• Engineered for a purposeful, sporty note without intrusive drone

Compatibility

• BMW M4 F82 Coupe with petrol particulate filter 2019 to 2020
• BMW M4 F83 Convertible with petrol particulate filter 2019 to 2020
• BMW M4 Competition OPF models 2019 to 2020
• Part number: SSXBM1127

What you can expect

Sharper response, quicker boost build and a richer, motorsport‑inspired exhaust note. The freer flowing design helps the S55 respond cleanly to tuning while keeping day‑to‑day refinement intact. Customers praise the build quality, the fit and the way the car comes alive across the rev range.

Installation and support

Professional fitting recommended. Book installation with MJ Modifications in Warwickshire for a seamless experience and aftercare support. For a fitting quote, email info@mjmodifications.co.uk.

Important notes

Designed for vehicles fitted with a petrol particulate filter. Check local regulations and emissions requirements before purchase and use. Intended for off‑road or track use where applicable.

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