Developed for compatible B58 applications, this catless downpipe replaces the restrictive factory primary catalytic converter with a straight-through exhaust path. The freer-flowing design reduces post-turbine backpressure, supporting quicker turbo response, increased performance potential, and a louder, more aggressive B58 exhaust note.
The downpipe is manufactured from 304 stainless steel and enclosed by a thermal insulation layer that helps reduce radiant heat transfer to nearby engine-bay components. Factory-style oxygen-sensor ports support installation on compatible vehicles.
Common B58 Applications
- Toyota GR Supra A90/A91 3.0 B58 - 2019+.
- BMW M240i / M240i xDrive - F22, F23, and G42 B58 models.
- BMW 340i / M340i and xDrive - F30, F31, F34, G20, and G21 B58 models.
- BMW 440i / M440i and xDrive - F32, F33, F36, G22, G23, and G26 B58 models.
- BMW 540i / 540i xDrive - G30 and G31 B58 models.
- BMW 740i / 740i xDrive - G11 and G12 B58 models.
- BMW X3 M40i / X4 M40i - G01 and G02 B58 models.
- BMW Z4 M40i - G29 B58 models.
Features
- Straight-through catless design.
- Integrated thermal insulation layer helps reduce radiant heat.
- 304 stainless-steel construction.
- Factory-style oxygen-sensor ports.
- Reduced exhaust restriction and post-turbine backpressure.
- Quicker turbo response.
- More pronounced turbo and exhaust sound.
Important Notes
FOR CLOSED-COURSE COMPETITION / TRACK USE ONLY.
This product removes the primary catalytic converter and is not intended for public-road use where emissions equipment removal is prohibited.
A catalyst-efficiency warning light is likely without compatible ECU calibration; suitable tuning is recommended.
Fitment can vary by B58 generation, production year, emissions specification, and GPF/OPF configuration.
Confirm the VIN, turbo outlet, mounting bracket, and original downpipe configuration before ordering.
Professional installation is recommended.
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.
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