B58 Super 150-Cell High-Flow Catted Downpipe

Designed for compatible BMW and Toyota vehicles powered by the B58 turbocharged engine, this high-flow catted downpipe replaces the restrictive factory primary catalytic converter with a freer-flowing exhaust path. The Super 150-cell catalytic converter reduces exhaust restriction while retaining a catalyst, supporting sharper turbo response, improved exhaust flow, and a deeper, more aggressive exhaust note.

Manufactured from 304 stainless steel, the downpipe features an integrated thermal insulation layer to help reduce radiant heat transfer to nearby engine-bay components. A stainless-steel flex section accommodates engine movement and thermal expansion, while factory-style oxygen-sensor provisions support installation on compatible vehicles. The catalyst and sensor layout are designed to minimise catalyst-efficiency warning lights on supported applications without ECU calibration.

Common B58 Applications

• 2020+ Toyota GR Supra A90 / A91 3.0 - B58 engine.
• 2020+ BMW G20 / G21 M340i 3.0.
• 2018+ BMW G30 / G31 540i 3.0.
• 2018+ BMW G32 640i 3.0.
• 2019+ BMW G14 / G15 / G16 840i 3.0.
• 2019+ BMW G29 Z4 M40i 3.0.

Features

• Super 150-cell high-flow catalytic converter.
• Integrated thermal insulation layer helps reduce radiant heat.
• 304 stainless-steel construction.
• Designed to minimise catalyst-efficiency warning lights on supported vehicles.
• Integrated stainless-steel flex section.
• Factory-style oxygen-sensor provisions.
• Reduced exhaust restriction and improved turbo response.
• Deeper, more aggressive exhaust note.
• 6-month limited product warranty.

Important Notes

Intended for street and performance use where permitted.

A 150-cell sport catalytic converter does not guarantee emissions or roadworthiness approval in every jurisdiction.

Catalyst-efficiency warning-light performance may vary depending on vehicle software, oxygen-sensor condition, fuel quality, and regional emissions specifications.

Confirm the VIN and original downpipe configuration before ordering.

Professional installation is recommended.

The six-month limited warranty applies from the original purchase date. Warranty terms and exclusions apply.