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.

All Racing Lab performance parts are covered by a 1-year limited warranty against manufacturing defects and workmanship issues.

Every component is rigorously inspected to ensure quality and reliability, so you can upgrade your vehicle with confidence. If any issues arise, our support team is ready to assist with fast and hassle-free warranty claims.

We accept returns under the following strict conditions:

Restocking Fee: A 20% restocking fee (deducted from the product purchase price) applies to all returned items.

Item Condition: Returned items must show no signs of use, installation, or wear.