Milltek OPF/GPF-Back Axle-Back Rear Section Silencer Back Box Exhaust - Quad 100mm Black GT100 Tips - BMW 3 Series G20 M340i xDrive Saloon 2019-2021 B58 - T304 Stainless - Proposed EC Approved - Cut to Fit - SSXBM1159

Milltek Rear Section Sports Exhaust - Quad Black 100 mm Tailpipes - BMW G20 M340i xDrive Saloon 2019 to 2021 - SSXBM1159

Give your G20 M340i the soundtrack and finish it deserves with this UK-engineered Milltek rear system. Designed to sit after the gasoline particulate filters, it keeps the factory GPF hardware in place while unlocking a deeper, more characterful B58 straight-six note and a sharper look thanks to the four black GT100 outlets. Part number SSXBM1159.

Crafted from premium T304 stainless steel with smooth mandrel bends, this performance rear section is built for durability, corrosion resistance and clean, consistent gas flow. Milltek invests heavily in acoustic tuning so you get a richer tone under load, a subtle burble at idle and a refined drive on long journeys with minimal cabin boom. The result is an OEM-plus feel with the excitement you want every time you press the start button.

Highlights

• Tailpipe style: quad black GT100 100 mm outlets for a stealth, motorsport-inspired finish
• Stainless steel T304 construction for long life in UK conditions
• Smooth-flow, mandrel-bent pipework engineered for response and consistency
• Developed for everyday usability with a mature tone and minimal drone
• Proposed EC Approved specification from Milltek
• Direct after-GPF rear section upgrade that keeps the factory particulate filters intact
• Milltek part number for easy ordering and support: SSXBM1159

Compatibility

• Make and model: BMW 3 Series G20 M340i xDrive Saloon
• Engine: 3.0 B58 turbocharged petrol straight-six
• Drivetrain: xDrive all-wheel drive
• Years: 2019, 2020, 2021
• Emissions hardware: for GPF and OPF equipped vehicles only
• Configuration: rear section after the particulate filters, quad outlet
• Installation note: cutting of the original exhaust is required during fitting

How it sounds and drives

Expect a deeper, more engaging tone that enhances the B58 character without turning every commute into a track day. Around town it stays civilised. Open it up and it delivers a crisp, sporty note that feels purposeful and premium. No harsh resonance, just a clean, balanced soundtrack.

Trusted by enthusiasts

We have installed this system on multiple G20 M340i cars and run it ourselves. Feedback from owners is consistently positive: richer sound, great-looking quad black tips and day-to-day refinement. It is a go-to rear exhaust upgrade for drivers who want style, build quality and a proper six-cylinder note.

Fitting service

Professional installation is recommended for the best alignment and finish. MJ Modifications offers fitting at our workshop in Warwickshire. For a quote or to book, email info@mjmodifications.co.uk.

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Part number: SSXBM1159