Remus Valved Axle-Back Performance Exhaust Rear Muffler/Back Box, Plug & Play OE Flap Control, Quad 102mm Angled Carbon Fibre Tips (Titanium Inners), Stainless Steel for BMW 5 Series G30/G31 540i B58B30A 2017+ Saloon & Touring

Transform the soundtrack and look of your BMW 5 Series with a premium valved rear section

Elevate your G30 or G31 540i with a high-quality sports rear box engineered for the B58B30A from 2017 onwards. This axle-back upgrade features quad 102 mm angled carbon fibre tailpipes with titanium inner sleeves, integrated flap control that works with your factory electronics, and a full stainless construction for durability and performance. Expect a sharper, motorsport-inspired tone when the valves open and a refined note when cruising. Hand built in Austria with a shot-blasted finish for an OE-plus appearance.

Part number: 088017 1500+0046 70CS

Why enthusiasts choose this rear box

• Valved rear section that plugs into the factory actuator system for seamless control
• Quad carbon fibre tips 102 mm angled with titanium inners for a premium finish
• Lower backpressure for improved responsiveness and a more engaging drive
• Lightweight build and full stainless steel for long-term reliability
• Shot-blasted surface and OEM-like fit for a clean, factory-style install
• Hand built in Austria with meticulous attention to detail

Compatibility

BMW 5 Series G30 and G31 540i 250 kW B58B30A, model year 2017 onwards. Saloon and Touring.

Important fitment note

Uses the original rear diffuser from the BMW G30 550i. BMW genuine part number: 51 12 8 067 763.

What you get

• Valved rear muffler assembly, left and right, designed for plug-and-play connection to the factory valve control
• Four 102 mm angled carbon fibre tailpipes with titanium internals
• All items engineered for precise fitment on the G30 and G31 540i

In-house experience and customer feedback

We have installed this upgrade on customer cars and in our own builds. Fitment is spot on, the sound is properly sporty when you want it, and owners love the aggressive look of the quad carbon tips. This is a genuinely high-end rear section that suits daily use and spirited driving.

Professional fitting

Want it installed by specialists who know these cars inside out? Book fitting with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quote and availability.

Search-friendly terms buyers use

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