Wagner Tuning F-Series B58 HJS-ECE Downpipe Kit

Unlock turbocharged performance on your 3.0 petrol BMW with this high-flow sport catalyst from Wagner Tuning. Designed for M140i, 340i, 440i and 540i models, this premium front section features an HJS 300 CPSI Euro 6 metal catalyst with ECE approval for exceptional flow, durability and reliability. Crafted from T304 stainless steel (1.4301) with a full 3.5 inch primary and a supplied adapter to join the factory system, it is a direct bolt-on upgrade that transforms response and sound while keeping quality and fitment first.

• High-flow HJS 300 CPSI metal sport cat for reduced exhaust backpressure and stronger midrange
• ECE-approved catalyst element for quality and conformity
• Constructed from corrosion-resistant T304 stainless steel 1.4301
• Full 3.5 inch tubing for superior gas velocity from the turbo outlet
• Adapter included to connect to the OEM exhaust system
• Direct-fit replacement for the factory catalytic section with OEM-style connections
• Lower thermal load on the turbo for improved reliability under sustained use
• Sharper throttle response and a deeper, sportier exhaust note

Fitment: BMW M140i including xDrive, 340i, 440i and 540i with the B58 3.0 turbo engine. Not compatible with cars equipped with a GPF or PPF.

Why choose this upgrade:

• Proven performance catalyst for BMW tuning enthusiasts seeking more power and torque
• Precision-made by Wagner Tuning for exact fit and long-term reliability
• Ideal foundation for stage 1 and stage 2 style remaps and other exhaust modifications

What we think:

We use these on our own builds and customer cars. Feedback has been outstanding, with noticeable gains in responsiveness and a cleaner, freer-revving feel. It is a superb upgrade for any B58 owner wanting a quality high-flow cat without compromising fitment.

Professional installation recommended. For fitting, book with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quote.

Keywords: BMW performance catalyst, high flow cat, sport cat, turbo outlet front pipe, exhaust upgrade, B58 tuning, M140i 340i 440i 540i performance, stainless steel cat section, ECE approved catalyst, 300 CPSI metal cat, UK BMW tuning.