B58 4.5" Catless Downpipe – Fits BMW M240i M340i M440i 540i 740i 840i X3 X4 X5 X6 X7 Z4 Supra A90 (2016–2024)

Unlock the true potential of your B58-powered BMW or Toyota Supra with the B58 4.5" Race Downpipe. By removing the restrictive factory catalytic converter, this upgrade transforms your driving experience with:

• Faster turbo spool for sharper throttle response

• Aggressive exhaust tone that delivers the best sound from your B58

• Noticeable horsepower and torque gains (25–30hp with tuning)

• Improved airflow that supports higher boost and big-power builds

Built from premium 304-grade stainless steel, this downpipe features precision TIG welds and a CNC-machined flange for a perfect seal and long-lasting durability. The mandrel-bent 4.5" design keeps exhaust flow smooth and unrestricted, maximizing performance across the powerband.

Best of all, it’s a direct bolt-on upgrade for both left-hand drive and right-hand drive vehicles. No cutting, no welding — just pure performance and sound. Compatible with OEM and most aftermarket exhaust systems.

Why You’ll Love It

• Best sound upgrade for the B58 engine – deeper, more aggressive, with turbo spool, you can actually hear

• Proven performance – supports significant power gains with a tune

• Built to last – stainless steel, TIG-welded, corrosion resistant

• Track-tested design – reliable under high heat and boost

• Plug-and-play fitment – installs using factory mounting points

Technical Specs

• Material: 304-grade stainless steel

• Flange: CNC-machined for precision fitment

• Diameter: Full 4.5" mandrel-bent tubing

• Welding: Hand TIG-welded for strength

• Performance: Supports 25–30hp gains with tuning

• Compatibility: Fits OEM and most aftermarket exhausts

• Design: Race configuration (catalytic converter removed)

Vehicle Fitment

Toyota Supra

• 2020–2024 A90 Supra (B58)

BMW 2 Series

• 2017–2024 M240i / M240i xDrive (B58)

BMW 3 Series

• 2016–2018 340i / 340i xDrive (B58)

• 2017–2019 340i GT xDrive (B58)

• 2020–2024 M340i / M340i xDrive (B58)

BMW 4 Series

• 2017–2024 440i / 440i xDrive (B58)

• 2021–2024 M440i / M440i xDrive (B58)

BMW 5 Series

• 2017–2023 540i / 540i xDrive (B58)

BMW 6 Series

• 2018–2019 640i xDrive (B58)

BMW 7 Series

• 2016–2022 740i / 740i xDrive / 745e xDrive (B58)

BMW 8 Series

• 2020–2024 840i / 840i xDrive / 840i Gran Coupe / 840i xDrive Gran Coupe (B58)

BMW X3

• 2018–2024 X3 M40i (B58)

BMW X4

• 2019–2024 X4 M40i (B58)

BMW X5

• 2019–2024 X5 xDrive40i / sDrive40i / xDrive45e (B58)

BMW X6

• 2020–2022 X6 sDrive40i / xDrive40i (B58)

BMW X7

• 2019–2022 X7 xDrive40i (B58)

BMW Z4

• 2020–2024 Z4 M40i (B58)

Important Note

This product is intended for off-road or track use only. It is not legal for use on public highways and may not comply with emissions regulations in your area. Please check local laws before installation.