R44 BMW F Series B58 Ceramic Coated Exhaust Catless Downpipe (M140i, M240i, 340i, 440i, G30 540i & more)

The R44 BMW F Series B58 Ceramic Coated Catless Downpipe is developed for drivers and tuners chasing maximum exhaust flow, sharper response and improved thermal control from their B58-powered BMW. Manufactured from high-grade stainless steel and finished with a durable ceramic coating, this downpipe replaces the restrictive factory catalytic converter to dramatically reduce back pressure. The ceramic coating helps manage under-bonnet temperatures, improving heat resistance and consistency under demanding conditions, while delivering a louder, more aggressive exhaust note and unlocking greater tuning potential at a sensible price point.

Key Features

• High-grade stainless steel construction

• Catless / decat design for maximum exhaust flow

• Durable ceramic coating for enhanced heat management

• Significant reduction in exhaust back pressure

• Faster turbo spool and reduced turbo lag

• Sharper throttle response

• Increased exhaust volume and aggression

• Raises the tuning potential of the B58 engine

• Supplied with a 1 year R44 Performance warranty and fitment guarantee

• Engineered for accurate fitment across a wide range of B58-powered BMW models

Important Disclaimer – Motorsport-Use Only

These downpipes are strictly for motorsport-use only. Removal of the OEM catalytic converter breaches European and international emissions regulations and may exceed permitted noise limits in certain countries. Vehicles fitted with this downpipe will fail a UK MOT test.

Fitting a catless downpipe will trigger an engine management light and may place the vehicle into limp mode. Custom coding or aftermarket tuning is required to operate this downpipe correctly. R44 strongly advises use limited to closed-course environments such as track or drag strip applications only.

Compatibility

• BMW M140i (F20 / F21)

• BMW M240i (F22 / F23)

• BMW 340i (F30 / F31)

• BMW 440i (F32 / F33 / F36)

• BMW G30 540i

• Other BMW models equipped with the B58 engine