4.5-Inch Gen 1 B58 Catless Downpipe

Maximise exhaust flow and unlock the true performance potential of your B58 engine.

Engineered for performance enthusiasts, the Quick Performance 4.5-Inch B58 Gen 1 Catless Downpipe is designed to reduce exhaust restrictions, enhance turbocharger response and deliver a more aggressive exhaust note from BMW’s renowned B58 turbocharged engine.

Manufactured from premium SS304 stainless steel, this downpipe offers excellent durability, corrosion resistance and long-lasting performance, making it an ideal upgrade for enthusiasts looking to take their B58 build to the next level.

Featuring an enlarged 4.5-inch design, our catless downpipe is engineered to maximise exhaust gas flow and minimise backpressure. By eliminating the restrictive factory catalytic converter, it allows exhaust gases to escape more freely, helping to improve turbocharger efficiency and support increased power output when paired with appropriate ECU tuning.

Whether you’re building a high-performance Stage 2 setup or simply looking to unleash the signature sound of your B58 engine, the Quick Performance 4.5-Inch Catless Downpipe delivers the exhaust flow and aggressive sound your build deserves.

Key Features

• Premium SS304 Stainless Steel: High-quality, corrosion-resistant construction designed to withstand demanding exhaust temperatures.
• Enlarged 4.5-Inch Design: Increased pipe diameter designed to reduce exhaust restrictions and maximise exhaust gas flow.
• Enhanced Turbo Response: Reduced exhaust backpressure can help improve turbocharger responsiveness.
• Aggressive Exhaust Sound: Delivers a louder, deeper and more pronounced exhaust note, enhancing the distinctive sound of the B58 engine.
• Performance-Oriented Design: Designed for enthusiasts looking to maximise the potential of their first-generation B58 engine.

Vehicle Compatibility

Designed for selected BMW models equipped with the first-generation 3.0L B58 engine, including:

• BMW M140i F20 / F21
• BMW M240i F22 / F23
• BMW 340i F30 / F31 / F34
• BMW 440i F32 / F33 / F36
• BMW 540i G30 / G31

Please note: This catless downpipe is intended for off-road and motorsport use only. Removing the factory catalytic converter can trigger engine warning lights, affect emissions compliance and make the vehicle unsuitable for public-road use. Professional installation and appropriate ECU calibration are recommended.