Description
RACING LAB · PRODUCT DETAILS
4.5-inch heat-shielded B58 catless downpipe — track only
A 4.5-inch insulated 304 stainless-steel downpipe for compatible B58 closed-course builds. The straight-through catless design includes factory-style oxygen-sensor ports and integrated heat shielding around the main pipe.
4.5 in
Downpipe
304
Stainless steel
Catless
Track use
Key features
✓Straight-through design
Replaces the primary catalytic converter with a freer-flowing exhaust path.
✓Integrated insulation
Helps reduce radiant heat exposure around the downpipe.
✓Sensor provisions
Factory-style oxygen-sensor ports on supported applications.
✓B58 performance focus
Intended for correctly matched, tuned track or competition builds.
Design & construction
The catless layout replaces the primary catalytic converter with a large-diameter straight-through exhaust path for closed-course motorsport applications. Integrated thermal shielding helps control radiant heat around the turbo and adjacent components.
Fitment & installation
Install only on a compatible closed-course B58 vehicle, with the correct turbo-outlet and downstream connections, oxygen-sensor positioning and heat clearance. Motorsport calibration and professional fitting are recommended.
What's included
- 1 × 4.5-inch insulated B58 catless downpipe
Vehicle fitment
ToyotaGR Supra A90 / A91 3.0 B58 — verify production year
BMWF22/F23/G42 M240i; F30/F31/F34/G20/G21 340i/M340i
BMWF32/F33/F36/G22/G23/G26 440i/M440i; G30/G31 540i
BMWG11/G12 740i; G01/G02 X3/X4 M40i; G29 Z4 M40i — supported B58 variants
Technical specifications
Diameter4.5 in
Material304 stainless steel
CatalystNone
Heat shieldingIntegrated insulating layer
Sensor fitmentFactory-style oxygen-sensor ports
CLOSED-COURSE / COMPETITION USE ONLY
This kit removes the primary catalytic converter and is not for public-road use.
Warranty
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.
Return Policies
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.
Free Shipping
Enjoy fast & free tracked shipping nationwide.
Pro Installation
Want a hassle-free installation? Book or enquire now.
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Why Buy From Racing Lab
Need help confirming fitment? Contact our Sydney team before ordering.
