1 2

Performance M

Remus Cat back Racing System Left/Right with Integrated valves using the OE valve control system with 4 tail pipes Ø 84 mm straight, carbon insert - 4 Series G22 M440i xDrive 275 kW B58B30B 2019-

Remus Cat back Racing System Left/Right with Integrated valves using the OE valve control system with 4 tail pipes Ø 84 mm straight, carbon insert - 4 Series G22 M440i xDrive 275 kW B58B30B 2019-

£3,047.14
£3,047.14
Sale Sold out
Shipping calculated at checkout.

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.

Transform your BMW G22 M440i with a premium valved performance exhaust that delivers sound, response and style. This Remus stainless system is a serious upgrade for the B58-powered 4 Series, combining factory-style valve control with quad straight-cut 84 mm outlets featuring carbon fibre inserts. Expect a deeper, more engaging tone with the valves open and a refined cruise with them shut, all while improving flow and shedding weight.

Why enthusiasts choose this upgrade

  • Valved performance exhaust that works with the car’s original electronics and drive modes
  • Quad 84 mm straight tips with real carbon fibre sleeves for a motorsport look
  • Precision Austrian craftsmanship, TIG-welded, shot-peened stainless steel
  • Lower back pressure for sharper throttle response and a livelier B58 soundtrack
  • Weight saving construction and an exact-fit installation
  • Proven on our own builds and loved by MJ Modifications customers for the balanced daily-drive sound and weekend aggression

Fitment and installation

  • BMW 4 Series G22 M440i xDrive, B58B30B, 2019 onwards
  • Requires M Sport specification
  • To achieve correct alignment, use with the BMW OEM rear diffuser from the M340i G20, part no. 51 12 8 069 391
  • Cutting of the factory exhaust is required during installation

System information

  • Removes the OPF/GPF. This can illuminate the engine management light and will typically require ECU calibration to code out related faults
  • Retains OEM valve control for true sound-on-demand

What you get

  • High-grade stainless cat-back assembly with integrated valves
  • 4 x 84 mm straight-cut tailpipes with carbon fibre inserts
  • Direct-connection hardware designed for precise fitment on the G22 chassis

Part numbers
085020 1000, 085020 0000, 085120 1500, 0046 83C

Professional fitting
For installation, mapping support and setup, we recommend booking with MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.

Search-friendly terms to help you find this upgrade
BMW G22 M440i performance exhaust, B58 valved exhaust system, quad carbon tip back box, stainless sports exhaust for 4 Series, M440i xDrive exhaust upgrade, Remus racing exhaust with valve control, left and right exit quad tips, cat-back for B58 G22, 84 mm carbon tailpipes.

View full details