Racing Lab B58 Super 150-Cell High-Flow Catted Downpipe

Designed for BMW and Toyota vehicles powered by the B58 turbocharged engine, this high-flow catted downpipe uses a Super 150-cell catalytic converter to reduce exhaust restriction while retaining a catalyst for street and performance applications where permitted. It delivers sharper turbo response, stronger exhaust flow, and a deeper, more aggressive exhaust note.

The 304 stainless-steel construction is paired with an integrated thermal insulation layer to help reduce radiant heat transfer to nearby components. A stainless flex section accommodates engine movement and thermal expansion, while the factory-style oxygen-sensor provisions support direct installation. The catalyst and sensor layout are engineered for CEL-free operation on supported vehicles without requiring 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 to reduce radiant heat
• 304 stainless-steel construction
• Designed for CEL-free operation with no ECU calibration required on supported vehicles
• Integrated flex section and oxygen-sensor provisions
• Improved exhaust flow, turbo response, and a deeper exhaust note
• 6-month limited product warranty

Important Notes

• Intended for street and performance use where permitted; a 150-cell sport catalyst does not guarantee emissions inspection approval in every jurisdiction.
• CEL performance can vary with vehicle software, sensor condition, fuel quality, and regional emissions specification.
• Confirm the VIN and original downpipe configuration before ordering. Professional installation is recommended.
• Six-month limited warranty applies from the purchase date; warranty terms and exclusions apply.