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

The R44 BMW F Series B58 200 Cell Sports Cat Downpipe is engineered to deliver a strong balance of improved exhaust flow, enhanced sound and dependable everyday performance for B58-powered BMW models. Manufactured from high-quality stainless steel, this downpipe replaces the restrictive factory catalytic converter with a high-flow 200 cell sports catalyst, significantly reducing back pressure while retaining a more controlled and refined exhaust note compared to a full catless setup. An integrated heat shield ensures effective thermal management and long-term durability, all delivered with R44’s focus on precise fitment and sensible pricing.

Key Features

• High-grade stainless steel construction

• High-flow 200 cell sports catalytic converter

• Integrated heat shield for improved thermal protection

• Reduced exhaust back pressure versus OEM

• Faster turbo spool and improved throttle response

• Enhanced exhaust tone without excessive harshness

• Increases 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 Recommended

While this downpipe retains a sports catalytic converter, fitment may still breach emissions and noise regulations depending on vehicle specification, tuning level and regional legislation. Vehicles fitted with a 200 cell sports cat 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. 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 - get in touch for fitment confirmation