Designed specifically for the GPF-equipped BMW M135i (F40), our acoustically tuned GPF back system is engineered to bring life back into an otherwise muted factory setup—without compromising everyday usability. At its core, the system delivers a cleaner, sharper, and more defined tone, while remaining completely drone-free for a comfortable driving experience. Through precise acoustic tuning, the sound stays controlled and composed during cruising, before opening up under load with a more expressive, purposeful character. Integrated electronic valve control ensures full compatibility with the factory driving modes, allowing the exhaust to seamlessly adapt between Comfort, Sport, and Sport+—retaining a quieter, more refined tone when needed, and a more aggressive note on demand. The system maintains an OEM+ aesthetic while enhancing the vehicle’s overall presence, with a choice of tailpipe options allowing for greater customisation and a more tailored finish. The result is a carefully balanced upgrade that combines clarity, control, and character—giving the M135i the sound it should have had from the factory.

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