Milltek Sport OPF/GPF-Back Axle-Back Performance/Sports Exhaust, Road, Polished GT-90 90mm Quad Tips for BMW M4 F82 Coupe, F83 Convertible & M4 Competition (2019-2020) | T304 Stainless Rear Silencer/Backbox Upgrade | S55 | SSXBM1126

Milltek OPF-back rear section with Polished 90 mm GT finishers for BMW M4 F82 Coupe, F83 Cabriolet and M4 Competition 2019 to 2020, T304 stainless, part number SSXBM1126

Give your S55-powered M4 the soundtrack it deserves with Milltek part number SSXBM1126. This OPF and GPF rear system replaces the exhaust from the particulate filter backward to unlock a deeper, more engaging tone while keeping everyday comfort intact. Crafted in the UK from high grade T304 stainless steel and finished with stunning polished GT-90 quad outlets, it delivers an OEM-plus look with a genuine motorsport edge.

Why enthusiasts choose this system

• Rich straight-six character with a sharper, crisper note under load
• Road sound level for refined daily driving and long-distance cruising
• No annoying cabin boom, carefully tuned for a clean, sophisticated soundtrack
• Premium 304-grade stainless construction for long-term durability and corrosion resistance
• Precision mandrel bends for consistent bore and smooth gas flow
• Hand finished in Britain to exacting standards by Milltek
• Polished 90 mm GT tailpipe finishers that fill the rear valance beautifully
• Direct replacement from the particulate filter back, keeps factory emissions hardware in place
• Genuine Milltek part number: SSXBM1126

Fitment and compatibility

• BMW M4 F82 Coupe, OPF or GPF equipped, 2019 to 2020
• BMW M4 F83 Convertible, OPF or GPF equipped, 2019 to 2020
• BMW M4 Competition F82 or F83, OPF or GPF equipped, 2019 to 2020
• Not suitable for earlier non-OPF cars
• Milltek reference: SSXBM1126

Designed to sound right, mile after mile

Milltek’s acoustic development focuses on a balanced tone that enhances character without harshness. Expect a deeper idle, a purposeful growl as revs rise and a mature note on the motorway. The result is an exhaust upgrade that feels special on weekend drives yet remains civil for the commute.

Built to perform and last

T304 stainless steel, non-magnetic, is used throughout for strength and longevity in UK conditions. Consistent mandrel-bent tubing helps maintain flow characteristics, supporting response without trading away mid-range tractability. The polished GT-90 quad finishers deliver a premium visual upgrade that suits both standard and Competition models.

What our customers say

We have installed this system on customer M4s and it has been a firm favourite. Owners praise the improved tone, the quality of the finish and the everyday usability. It is the ideal choice if you want more presence without unwanted resonance.

Professional installation

For fitting, we recommend our workshop at MJ Modifications in Warwickshire. Request a tailored installation quote by emailing info@mjmodifications.co.uk.

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