Wagner Tuning F-Series B58 Catted Downpipe Kit

High‑flow sports cat pipe for BMW 3.0 B58 turbo models

Unlock sharper throttle response, freer revving performance and a deeper exhaust note with this premium performance catalyst pipe. Crafted from corrosion‑resistant 1.4301 stainless steel, it features a full 3.5 inch primary section with a reducer to join the factory system, giving a true bolt‑on upgrade that replaces the restrictive OE catalytic assembly.

Choose between a Euro 6 200 CPSI motorsport metallic core for fast light‑off and strong flow, or a straight‑through option for maximum gas velocity. Both options are designed for precise fitment, lower exhaust back pressure and reduced thermal load on the turbine housing, helping the turbocharger spool quicker and pull harder through the rev range.

Why enthusiasts choose this upgrade

• Significant back pressure reduction for improved power potential and torque gains
• Lower turbine temperatures to protect the turbo under sustained load
• CNC‑style flanges and 1.4301 (SS304) material for long‑term durability
• 3.5 inch main section with adapter for the stock exhaust system
• Direct replacement for the original catalytic section with an exact, hassle‑free fit
• Available as 200 CPSI Euro 6 racing metal cat or without catalyst

Vehicle compatibility search terms

Designed for the BMW 3.0 petrol B58 engine in the following platforms:

• 1 Series F20 F21 M140i and M140i xDrive
• 2 Series F22 F23 M240i
• 3 Series F30 F31 340i
• 4 Series F32 F33 F36 440i
• 5 Series 540i with B58 engine

Common search phrases: BMW M140i sport cat, M240i high flow catalyst, 340i catless pipe, 440i performance exhaust upgrade, 540i B58 turbo outlet, BMW B58 sports catalyst, F20 F21 F22 F30 F32 performance cat pipe.

Real world results

We have fitted this upgrade for customers who wanted stronger mid‑range punch, quicker spool and a more engaging sound without drone. Feedback has been excellent, with drivers praising the quality, fitment and reliability.

Important fitment notes

• Only suitable for cars without a GPF
• May trigger a fault indication in the ECU depending on software setup

Professional installation available

For fitting, book with MJ Modifications in Warwickshire. Request a tailored quote at info@mjmodifications.co.uk.