Cobra Sport BMW 1 Series M140i B58 Downpipe/Front Pipe F20 F21 LCI 2015-2019 - De-Cat (Catless) or High-Flow Sports Cat - 3.5in 88.9mm Turbo Outlet Performance Exhaust Upgrade - Decat, Cat Delete, Catted Downpipe

Cobra Sport M140i B58 Front Pipe Upgrade - Cat Delete or High-Flow Catted Option - 3.5 inch 88.9 mm

Unlock the real character of your BMW 1 Series M140i with this Cobra Sport turbo outlet front section. Engineered in large-bore 3.5 inch 88.9 mm pipework from the turbine housing to the centre section, it replaces the restrictive factory catalyst to deliver quicker boost response, freer exhaust flow and a sharper, more purposeful soundtrack. We have installed these at MJ Modifications and our customers love the improved urgency and tone with both the cat delete and the high-flow catted variants.

Highlights

• Big-bore 3.5 inch 88.9 mm tubing for excellent gas velocity and reduced back pressure
• Direct replacement from turbo to centre section for an easy upgrade path
• Choice of high-flow catted unit or catless race pipe to suit your build
• Noticeably faster spool and crisper throttle response across the rev range
• More engaging, sportier exhaust note without cabin droning when paired with a quality cat-back
• Supplied with relevant fittings and gaskets to simplify installation
• Covered by Cobra Sport Lifetime Warranty non-transferable

Options and part numbers

• BM85 - High-Flow Sports Catalyst - Designed to pass a UK MOT emissions test and police roadside checks while boosting performance and tone. Ideal for fast-road and track-day cars that need to remain emissions compliant.
• BM76 - Cat Delete - For motorsport and off-road use only. Maximises flow and response for dedicated track builds. Will not pass a UK MOT emissions test or police roadside checks.

Vehicle compatibility

BMW 1 Series M140i with the B58 engine

• Chassis: F20 F21 LCI
• Years: 2015 - 2019

What you receive

• Cobra Sport M140i turbo outlet front pipe in 3.5 inch 88.9 mm configuration
• Relevant gaskets and fittings

Real-world results

Fitted by MJ Modifications on numerous B58 builds, this front pipe consistently delivers a stronger mid-range, cleaner top-end pull and a more aggressive, motorsport-inspired tone. Whether you choose the catted or catless version, it is a proven upgrade that supports further tuning hardware and software.

Installation and support

Professional fitting is recommended. For expert installation at MJ Modifications in Warwickshire or to request a quote, email info@mjmodifications.co.uk. Our team has extensive hands-on experience with these systems and can advise on the best configuration for your goals.

Manufacturer and warranty

Manufactured by Cobra Sport

Cobra Sport Lifetime Warranty non-transferable

Road legality

• BM85 High-Flow Sports Catalyst is designed to pass a UK MOT emissions test.
• BM76 Cat Delete is for off-road and competition use only and will not pass a UK MOT emissions test.

Search-friendly terms

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