AC Schnitzer Valved Quad Exhaust Rear Silencer for BMW 5 Series 540i G30/G31 Saloon/Touring M Sport, Performance Back Box/Muffler, Quad Pipe Conversion, Stainless 90mm Tips (Ceramic Black or Chrome), Includes Lower Bumper Insert

Unlock the perfect soundtrack and a premium quad-exit look for your BMW 5 Series 540i G30 and G31 with this AC Schnitzer performance rear section. Crafted from high quality stainless steel, this lightweight back box delivers a richer tone under load and a refined note on the cruise, while elevating the rear styling with four bold 90 mm outlets. This is the upgrade enthusiasts choose when they want a valved system that keeps factory electronics and day-to-day usability, but adds drama when you want it.

Why enthusiasts choose this upgrade

• Premium stainless construction for durability and corrosion resistance
• Quad 90 mm outlet design for an aggressive OE-plus finish
• Choice of polished chrome tips or satin ceramic black tips, both with AC Schnitzer branding
• Retains OEM flap control for switchable volume via the car’s original drive modes
• Export version includes a sound tube for a more pronounced, sporty character
• Noticeable weight saving over the standard rear silencer

Compatibility and notes

• For BMW 540i G30 saloon and G31 touring with M Sport styling only
• Not suitable for EU6 RDE vehicles. Unsure about your car’s status? Email us your VIN and we will confirm fitment
• Pricing varies depending on tip finish selected

Included trim and options

• Supplied with a replacement lower bumper insert as shown in image 1, designed to accept the quad outlets
• The supplied insert is compatible with the OEM towbar set-up
• Can be paired with the AC Schnitzer rear diffuser as an alternative styling option. Note: the diffuser cannot be used with a towbar

Ideal search terms

BMW 540i G30 G31 exhaust upgrade, quad exit muffler, performance back box, valved 5 Series exhaust, quad pipe conversion, ceramic black exhaust tips, chrome exhaust tips, rear bumper insert, AC Schnitzer 5 Series tuning, BMW 540i quad exhaust system UK.

Installation and support

We recommend professional fitting. MJ Modifications in Warwickshire offers full installation and aftercare for this system. To arrange a fitting quote or to confirm compatibility with your VIN, contact info@mjmodifications.co.uk.

Proven on customer cars

We have fitted this system for multiple 540i owners and the feedback is consistently positive: deeper tone, smarter appearance, and OEM-like integration with the car’s driving modes. It is a genuine step up for anyone wanting a tasteful sound and a distinctive quad-exit finish.