Remus Valved Sport Rear Exhaust / Back Box / Muffler / Rear Silencer for BMW M3 G80 & M4 G82 (2021+) - Stainless Axle-Back, OEM Valve Control, OPF/GPF Safe, ECE Approved - Fits M3/M3 Competition & M4/M4 Competition - Austrian Made (Tips Sold Separately)

Remus Rear Section for BMW G80 M3 and G82 M4

Turn your M car into the soundtrack it deserves with Remus. This valve‑controlled stainless rear exhaust section is a direct replacement for the factory back box on 2021 onwards G80 M3 and G82 M4 models, including Competition variants and cars fitted with a particulate filter. Expect a deeper, richer tone, sharper response and a premium finish, all with factory flap integration for quiet starts and civilised cruising.

We run Remus on our own builds and our customers love the quality, fit and sound. If you have been searching for terms like BMW M3 G80 rear silencer upgrade, BMW M4 G82 sports back box, performance muffler M3 M4, OPF safe M exhaust, ECE approved road legal exhaust, Remus M3 M4 rear section or stainless valved rear muffler, this is the setup that keeps coming out on top.

Highlights

• Valve‑controlled rear section for an authentic motorsport soundtrack with everyday refinement
• Stainless construction with shot‑blasted finish for durability and a high‑end look
• Lower back pressure for a freer‑flowing rear section and improved responsiveness
• Factory electronic flap compatibility retained via original actuators
• ECE approved for road use where applicable
• Hand‑built in Austria with precise jig‑built fitment

What is included

• Remus sport exhaust centre section using the absorption principle
• Connection tube package with spherical connection and integrated valves
• Mounts to factory points for an OE‑quality installation

Pipe diameter

• Original tubing: 70 mm
• Remus tubing: 76 mm

Tailpipe trims sold separately

Choose your finishers to complete the look of your M3 or M4:

• Stainless chromed angled rolled edge, 102 mm
• Stainless chromed angled straight cut, 102 mm
• Stainless chromed straight cut with carbon insert, 98 mm
• Stainless black chrome straight cut with carbon insert, 98 mm
• Carbon tailpipe set with titanium internals, 102 mm

Fitment and notes

• BMW G80 M3 and G80 M3 Competition 2021 onwards, with or without particulate filter
• BMW G82 M4 and G82 M4 Competition 2021 onwards, with or without particulate filter
• Remus type: G234M
• The original rear section requires a cut for installation
• Spherical connection for precise alignment to OE mounting points

Part numbers

081021 1400 + 081021 1500

Why Remus on your M3 or M4

• Genuine performance exhaust specialist with decades of motorsport heritage
• Lightweight rear section compared to the factory assembly
• Refined sound control via factory valves for comfort and aggression on demand
• Consistently positive owner feedback on tone, fit and finish
• 24 month Remus warranty

Professional installation

Want it fitted by experts who build and maintain these cars every day? Book installation at MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a fitting quote and availability.

Compatibility check

For peace of mind before dispatch, provide your UK registration or the last 7 digits of your VIN at checkout and we will confirm suitability.

Search terms our customers use

BMW M3 G80 rear exhaust, BMW M4 G82 rear box, M3 Competition sports muffler, M4 Competition performance rear silencer, Remus G80 G82 back box, valve control exhaust M3 M4, OPF friendly M exhaust, road legal ECE exhaust UK, stainless rear section M3 M4, Austrian made exhaust upgrade, plug and play valve flaps, carbon exhaust tips BMW M, titanium internal tips, low restriction rear muffler.