Transform the character of your BMW F40 M135i with the Milltek Sport Quad Exhaust System — a precision-engineered upgrade designed to unlock a sharper, more purposeful exhaust note while improving overall performance. Developed specifically for the F40 platform, this system enhances the B48 engine’s sound profile, reduces back pressure, and offers weight savings over the factory system.

Ideal for enthusiasts seeking a more engaging driving experience, whether on spirited B-road drives, track days, or fast road applications, this system delivers an aggressive yet refined exhaust tone synonymous with Milltek’s motorsport heritage.

Key Features

• Signature Milltek Sport exhaust tone with increased presence and aggression

• Improved exhaust gas flow and reduced back pressure
  

• Tailpipe finish options: Polished, Cerakote Black, Titanium, Burnt Titanium

• Manufactured in the UK using 304L aerospace-grade stainless steel

• Direct bolt-on valved replacement system
  

Compatibility

BMW M135i F40

Ideal For

This system is the perfect choice for BMW M135i F40 owners looking to:

• Enhance the sound and character of their B48-powered car

• Reduce weight and improve exhaust flow for sharper throttle response

• Increase presence on the road or track without compromising refinement

• Opt for a bolt-on solution from a respected, established performance brand

Why Choose Milltek Sport

Milltek Sport are one of Europe’s leading manufacturers of performance exhaust systems, with over 40 years of motorsport and road car development expertise. Every system is designed, developed, and manufactured in the UK, ensuring exceptional quality, fitment, and performance.

The Milltek system for the F40 M135i is a proven upgrade in the enthusiast community, offering a well-balanced blend of increased volume, improved tonal quality, and tangible performance benefits. Available in a range of configurations and tailpipe options, it’s a versatile, futureproof exhaust upgrade whether you’re keeping the car stock or running aftermarket software.