Remus Valved Cat-Back Exhaust for BMW M3 G80 & M3 Competition (2021+) S58 — OE Switchable Flap Control, Stainless Performance Rear Section/Backbox, Quad 102mm (4") Angled Straight-Cut Chrome Tips

Performance Valved Exhaust Upgrade for BMW M3 G80 2021-on

Transform your G80 with a premium stainless valved rear section designed for the S58 twin turbo engine. This high quality system delivers a deeper, motorsport-inspired tone with the valves open and a refined note when closed, all while keeping the factory-controlled flap functionality for everyday usability. Expect freer breathing, sharper response and a purposeful soundtrack that truly suits the M car character.

Handcrafted in Austria, this exhaust features a bead-blasted finish, precision welds and exact geometry for a precise fit. The large diameter quad outlets with polished chrome finish and straight-cut slanted design fill the diffuser perfectly and give the rear end a serious, OEM-plus look.

Why choose this system

• Keeps the stock electronic valve actuation for switchable sound via the original controls
• Full stainless construction with a durable bead-blasted surface
• Optimised flow path for reduced restriction and genuine performance improvement
• Lighter than the factory setup for improved efficiency
• Accurate fitment and superb build quality, crafted by hand in Austria
• Quad chrome outlets with an aggressive straight cut slant for a perfect visual finish

Fitment

Made specifically for the BMW M3 G80 2021-on with the S58 engine. The original system requires cutting at the prescribed point during installation.

Installation and support

Professional fitting recommended. MJ Modifications offers expert installation at our Warwickshire workshop. For a fitting quote or advice, email info@mjmodifications.co.uk.

Part Number

081021 1200 + 081021 1300 + 081021 1400 + 081021 1510 + 0046 70SG

What you can expect

• Track-inspired sound character when valves are open, subtle tone when closed
• Noticeable flow gains thanks to a freer breathing layout with reduced back pressure
• High corrosion resistance from full stainless steel construction
• Premium finish that looks as good as it sounds

Our clients love this upgrade on the G80 platform for its quality, tone and drivability. It is a popular choice for enthusiasts seeking a serious sound and performance uplift while keeping daily comfort with valve control.

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