R44 BMW F Series B58 Exhaust 200 Cell Euro 6 (Non-CEL) Sports Cat Downpipe (M140i, M240i, 340i, 440i, G30 540i & more)

The R44 BMW F Series B58 5.0" 200 Cell Euro 6 (Non-CEL) Sports Cat Downpipe is engineered for customers seeking maximum exhaust flow and sound improvement while retaining a high-quality sports catalyst. Manufactured from high-grade stainless steel, this large-bore 5.0-inch design dramatically reduces exhaust restriction compared to the factory downpipe, allowing the turbo to breathe more freely. Featuring a 200 cell Euro 6 sports catalytic converter designed to be non-CEL when correctly configured, this downpipe delivers faster turbo spool, sharper throttle response and a more pronounced exhaust note, all with precise fitment and a sensible price point.

Key Features

• High-grade stainless steel construction

• Large-bore 5.0-inch pipe diameter for maximum exhaust flow

• High-flow 200 cell Euro 6 sports catalytic converter

• Designed to be Non-CEL when correctly coded or tuned

• Significant reduction in exhaust back pressure

• Faster turbo spool and improved throttle response

• Enhanced exhaust sound and presence

• Increases tuning potential of the B58 engine

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

• Engineered for accurate fitment across multiple B58-powered BMW models

Important Disclaimer – Motorsport-Use Recommended

While this downpipe features a Euro 6 200 cell sports catalyst, fitment may still breach emissions and noise regulations depending on vehicle specification, tuning level and regional legislation. Vehicles fitted with this downpipe may fail a UK MOT test, particularly when combined with aftermarket software.

Installation may trigger an engine management light, and custom coding or aftermarket tuning may be required to ensure correct operation, even on Non-CEL configurations. R44 recommends this product primarily for motorsport-use or closed-course applications and advises customers to check local regulations before installation.

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.