BMW M240i (G42) (21>) Venom Race Rear Axle Back (Back Box Delete) Performance Exhaust

Important: this rear section is built without a silencer and delivers a very loud, raw soundtrack.

Turn up the drama on your G42 M240i

Unlock the true character of the B58 inline‑six with this Venom axle‑back system for the BMW G42 M240i xDrive. Engineered in 3 inch / 76.2 mm pipework and replacing the factory rear box, this performance rear section frees up the exhaust note, cutting unwanted restriction and letting your coupe sound as aggressive as it looks. It fits to the original tailpipe exits for a clean OE+ finish.

Why enthusiasts choose this rear section

• Back box delete for maximum soundtrack - deep tone, fierce crackles and a race‑bred character
• MOT and emissions compliant while dramatically increasing volume
• Substantial weight saving: 8.52 kg system weight - 7.58 kg lighter than stock
• Designed to integrate with the factory outlet trims for a discreet, factory-style appearance
• Supplied with all required fittings and gaskets for a straightforward install

Real-world sound data

• Idle in Sport mode: 66.8 dB - up by 9.6 dB over standard
• Static test at 4,000 rpm: 100.9 dB - up by 5.9 dB over standard

Built for drivers who want more

This innovative Venom rear section removes the silencer on the M240i’s B58 turbocharged straight‑six to unleash serious volume and emotion, without compromising road legality. Expect a sharper, more motorsport-inspired tone and a noticeable reduction in rear-end mass.

Non-valved design

This system does not retain exhaust valves. There is no harm to vehicle operation - you simply won’t have selectable sound modes. The acoustic profile has been carefully tuned with this in mind.

Fitment

BMW M240i G42 - 2021 onwards, including xDrive variants. Direct connection to the OE outlet positions.

We’ve fitted it - customers love it

We run this upgrade on customer cars and the feedback is consistently positive: louder, meaner and far more engaging, with a quality tone that suits daily driving and weekend blasts alike.

Professional installation

Want it fitted by specialists who know these cars inside out? Book your installation with MJ Modifications in Warwickshire. Request a fitting quote: info@mjmodifications.co.uk.

Included in the box

• Venom axle‑back rear section - 3 inch / 76.2 mm pipework
• All relevant fittings and gaskets
• Cobra Sport lifetime guarantee for peace of mind

Search-friendly terms

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Media

Sound and first drive - BMW M240i G42 Venom rear exhaust

Static sound example - BMW M240i G42 Venom rear exhaust