Milltek Sport OPF/GPF-Back Exhaust for BMW G20 3 Series M340i/340i xDrive (B58, 2019+) | ECE Approved Stainless Cat-Back/Rear Section | OE Trim or Quad Exit Tips

Milltek OPF friendly rear system for BMW 3 Series G20 340i xDrive

Give your G20 340i xDrive the soundtrack and presence it deserves. This EC type approved Milltek rear section fits after the gasoline particulate filter, unlocking a deeper, sportier tone with everyday refinement. Keep the factory look by retaining the original bumper finishers, or switch to an aggressive quad outlet tailpipe set in black ceramic coated or mirror polished stainless for a true factory-plus aesthetic.

We have installed this system on multiple customer cars and on our own builds. Fitment is precise, alignment is spot on, motorway manners are calm with no intrusive drone, and the straight six character really comes alive when you lean on the throttle. It looks premium, sounds premium and performs like a high quality UK made system should.

Why enthusiasts choose this upgrade

• EC type approved and particulate filter friendly for road use in the UK and Europe
• Direct post-OPF fitment for the 3 Series G20 340i xDrive with the B58 turbocharged straight six
• Two visual routes: retain OE bumper trims or go quad outlet tailpipes in black ceramic coated or polished
• Engineered for improved gas flow and a richer, more engaging note under load
• Designed and manufactured in the UK by Milltek with excellent fit and finish

Part numbers and options

• SSXBM1157 - OPF back system designed to work with the original bumper finishers
• SSXBM1158 - OPF back system with Milltek quad polished tailpipes
• SSXBM1159 - OPF back system with Milltek quad black ceramic coated tailpipes

Vehicle compatibility

BMW 3 Series G20 340i xDrive Saloon, B58 petrol engine, 2019 onwards, OPF equipped.

Note: the factory system requires a cut for installation.

Optional pairing

Ready to take the next step later on. Milltek cast downpipes with HJS high flow sports catalyst use a premium 200 cell core that flows significantly better than typical OEM 500 to 600 cell units, helping maintain emissions performance while unlocking greater tuning potential on the B58 platform.

Real world feedback

Our customers consistently praise the sound quality, the perfect tip alignment and the high grade construction. It is a superb daily friendly sound upgrade that still turns heads when you want it to.

Installation and support

Professional fitting available at MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Warranty

Milltek 2 year warranty on catalytic components and lifetime warranty on the downpipe.

Made by Milltek Sport

Designed and manufactured in the UK with continuous R&D focused on modern BMW platforms, ensuring the G20 340i receives a system that fits right, looks right and sounds right.

Search terms to help you find this product

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