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

Unless explicitly stated otherwise, all products sold by R44 Performance Limited are designated RACE ONLY and are solely for competition or off-road use limited to racing formally sanctioned by a recognized racing organization. Any other use, including recreational off-road use, may violate local, state, and Federal laws. R44 Performance Limited does not implicitly or explicitly confirm the legality of using any products it sells on public roads; that is entirely the responsibility of the consumer.

It is the responsibility of the customer to check with all federal, state local and environmental laws before ordering and installing a product. R44 Performance Limited is not responsible for any fees, fines or costs that a customer may incur as a result of failing to check with federal, state, local or environmental laws before ordering and installing a product.

We get a large number of custom orders and requests everyday, so as a result it is not always possible for us to keep every item in stock at all times in our warehouse. If you require the item urgently please contact our sales team here to check the stock before you make your purchase.

We totally understand if you're not certain a part will be compatible with your car, so we highly recommend contacting us here with your query. Our friendly sales team will then be in touch to confirm if this part is the correct part you are looking for.

All in stock products ship the same day if ordered before 2pm GMT

For out of stock items we will contact you with an estimated wait time if not otherwise specified above.

We offer worldwide shipping on all products. If upon receiving your product you wish to return; we offer a 30-day returns policy. For our in-depth returns information please follow the link. "R44 Returns Policy

All of our products come with a standard warranty of 1-3 years. This is dependant on the type of product however. For more details please see our warranty page here.