Dinan Free Flow Axle-Back Exhaust for BMW 5 Series G30 540i (B58) | Performance Sports Exhaust / Rear Silencer / Back Box Muffler Upgrade | 304 Stainless Steel, Non-Valved, Helmholtz Drone Reduction, Bolt-On | Dual Black Ceramic Rectangular Tailpipes

Turn your BMW 540i into the soundtrack it deserves. This Dinan rear section unleashes the straight six voice of the B58 while keeping everyday refinement intact. Expect quicker response, freer breathing and a deeper, richer note that stays calm on a steady cruise then delivers a crisp growl with addictive burbles when you press on.

Inside the cabin there is no annoying boom thanks to a tuned Helmholtz resonator that targets low rpm resonance. Outside, the tone is purposeful and mature with a premium finish to match. It looks every bit as special as it sounds.

Built from heavy duty 16 gauge 304 grade stainless, the system is designed for long term use on UK roads. It mounts to the original hangers for a precise, rattle free fit and includes the required hardware for a straightforward installation. The visual highlight is a pair of oversized quadrilateral black ceramic coated tailpipes, each laser etched with the Dinan logo, measuring over 8 inches wide and 4 inches tall. The result is a more assertive rear end that complements the G30’s clean lines.

We have installed and run this system ourselves at MJ Modifications and customer feedback has been consistently positive for sound quality, fitment and finish. If you want a refined daily with weekend attitude, this is a superb choice for the B58 powered 5 Series.

Why enthusiasts choose this upgrade

• Power gains up to +6 hp and +5 lb ft
• Deeper, sportier tone with characterful overrun burbles
• Helmholtz technology to reduce low speed drone for relaxed motorway use
• Oversized black ceramic tailpipes with laser etched branding
• 16 gauge 304 stainless construction for durability and corrosion resistance
• OE valve is not retained for consistent flow and sound
• Direct fit using factory mounting points with hardware included

Fitment

BMW 5 Series G30 540i with B58 engine. Rear section configuration.

Important note

The stock computer controlled flap is deleted on this system.

Installation and fitting

This is a direct fit upgrade and includes the required mounting hardware. Professional fitting is recommended. For expert installation, contact MJ Modifications in Warwickshire for a quote at info@mjmodifications.co.uk.

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