Cobra Sport 3" De-Cat Downpipe – BMW M140i / M240i (B58)

The Cobra Sport 3" de-cat downpipe is a high-performance upgrade designed to replace the restrictive factory catalytic converter on B58-powered BMWs. By removing the catalyst and increasing pipe diameter, this system dramatically improves exhaust flow, turbo response and overall performance while delivering a louder, more aggressive exhaust tone.

Fitment: BMW B58 Models
SKU: BM76

Key Features

3" Large Bore De-Cat Design

– Replaces restrictive OEM catalytic converter
– 3" (76.2mm) mandrel-bent pipework for maximum flow
– Designed to optimise turbo efficiency

Maximum Performance Gains

– Increased horsepower and torque potential
– Faster turbo spool and reduced lag
– Proven gains when paired with tuning

High Quality Stainless Steel Construction

– Manufactured from T304 stainless steel
– TIG welded for strength and durability
– Corrosion-resistant for long-term use

Direct Replacement Fitment

– Fits from turbo to centre exhaust
– Supplied with required fittings and gaskets
– Designed for bolt-on installation

Benefits

– Significant increase in exhaust flow
– Noticeably louder, more aggressive exhaust note
– Improved throttle response and turbo performance
– Essential upgrade for Stage 2 and beyond

Fitment

– BMW M140i F20 / F21
– BMW M240i F22 / F23
– B58 engines

Installation Notes

– Direct bolt-on installation
– ECU remap required to maximise performance and avoid EML lights
– Designed for motorsport/off-road use only (not road legal in many regions)