Performance M
Remus Axle-Back Valved Exhaust for BMW 3 Series G20/G21 M340i xDrive (2019+) - Stainless Rear Silencer/Muffler with OEM Valve Control, Quad 84mm Chrome Rolled Tips - Performance Rear Box/Backbox B58B30B Saloon/Sedan & Touring/Estate
Remus Axle-Back Valved Exhaust for BMW 3 Series G20/G21 M340i xDrive (2019+) - Stainless Rear Silencer/Muffler with OEM Valve Control, Quad 84mm Chrome Rolled Tips - Performance Rear Box/Backbox B58B30B Saloon/Sedan & Touring/Estate
Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.
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Premium rear silencer upgrade for BMW G20 G21 M340i xDrive B58 2019 onwards
Unlock a deeper, motorsport-inspired tone and elevate the look of your 3 Series with this high-quality rear section exhaust featuring factory valve control and quad 84 mm chrome tailpipes. Crafted in Austria and built from full stainless steel with a bead‑blasted finish, this precision system delivers a ferocious soundtrack, freer flow and a purposeful rear-end aesthetic to match the performance of your B58-powered M340i saloon or touring.
Why enthusiasts choose this performance rear box
- Ferocious, tuned exhaust note with everyday refinement thanks to valve actuation via the car’s standard drive modes
- Free-flowing design for reduced backpressure and improved response
- Lightweight stainless construction with bead‑blasted surface for durability and a premium look
- Exact-fit geometry for the G20 and G21 platform with dual exit left and right
- Hand finished in Austria for outstanding quality
- Quad 84 mm angled, rolled-edge, high-polish chrome tips that perfectly fill the diffuser
Fitment and compatibility
- BMW 3 Series G20 G21 M340i xDrive, B58B30B, 275 kW, 2019 onwards
- Requires M Sport package and the genuine M340i G20 rear diffuser (BMW part no. 51 12 8 069 391)
- The factory exhaust needs to be cut at the specified position during installation
Real-world results
We have installed this system on customer cars and the feedback is consistently positive. Owners love the aggressive tone under load, the subtle cruise manners with valves closed and the premium look of the 84 mm chrome tips. Fitment is spot on, and the OEM valve integration keeps everything seamless.
Technical highlights
- Material: 100 percent stainless steel with bead‑blasted finish
- Valve operation: uses the car’s original electronics and actuators
- Configuration: rear section left and right with quad tailpipes
- Design goals: optimised gas flow, reduced backpressure, lower weight, precise fit
Part numbers
Manufacturer reference: 085020 0000 + 085120 1500 + 0046 55S
Installation and support
Professional fitting recommended. For supply and installation by specialists, book with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.
Search-friendly terms
BMW G20 M340i exhaust upgrade, G21 M340i touring performance exhaust, B58 valved rear silencer, quad tip chrome 84mm tailpipes, M340i xDrive sports muffler, rear section exhaust G20, performance rear box BMW 3 Series, M340i stainless exhaust with OEM valve control.
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