BMW
Genuine BMW M Performance Centre/Center Exit Axle-Back/Axleback Exhaust Rear Silencer | G80/G82 M3/M4 (2021+) incl Competition | OEM Back Box/Backbox Muffler/Rear Box | OE Part 183
Genuine BMW M Performance Centre/Center Exit Axle-Back/Axleback Exhaust Rear Silencer | G80/G82 M3/M4 (2021+) incl Competition | OEM Back Box/Backbox Muffler/Rear Box | OE Part 183
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.
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Original BMW M Performance Rear Box for G80 M3 and G82 M4 — Centre Exit Style
Give your 2021 onward M3 or M4 the factory centre exit look and sound with this authentic BMW M Performance rear box. As an original equipment axle-back unit, it delivers precise fitment, flawless alignment and the premium finish you expect from BMW. When combined with the required centre-mounted tailpipe trim and carbon rear diffuser, it completes the iconic BMW M centre exit appearance with a richer, more purposeful tone that still suits daily driving.
Our team has installed this upgrade many times and the result is always the same — superb fit, OEM-quality refinement and very happy customers who want that motorsport-inspired centre exit without compromise.
Key benefits
- Authentic BMW M Performance axle-back for G80 M3 and G82 M4, including Competition models
- Original equipment part for perfect alignment and hassle-free installation
- Centre exit layout transforms the rear profile when paired with the matching trim and diffuser
- Deep, sporty tone engineered by BMW while maintaining comfort on longer trips
- Factory-developed upgrade for seamless integration with your car’s systems
What is included
Rear silencer assembly only.
Important: Tailpipe trims are not included. To complete the centre-mounted outlet you will also require:
- BMW M Performance Titanium Tailpipe Trim Module — required for the centre exit tips
- BMW M Performance Carbon Fibre Rear Diffuser — required for the centre exit layout
Vehicle applications
- BMW M3 G80 2021+
- BMW M3 G80 Competition 2021+
- BMW M4 G82 2021+
- BMW M4 G82 Competition 2021+
Part number
18305A23283
Manufacturer
BMW M Performance — original BMW part.
Warranty
Two year BMW manufacturer warranty when a valid VIN is supplied at checkout.
Professional fitting
We recommend expert installation. MJ Modifications in Warwickshire can supply and fit this upgrade. For a fitting quote or to book your car in, email info@mjmodifications.co.uk.
Why buy this upgrade
- Gives your M3 or M4 the genuine BMW centre exit rear box look with factory reliability
- Designed by BMW for the best compatibility and finish — no cutting corners
- Sound is sportier and more characterful without unwanted drone
- Ideal for owners who want an OEM-plus exhaust solution
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