MAD B58 V2 4.5" Downpipe W/ Bracket BMW F, G Chassis & Supra

Upgrade from the stock B58 downpipe to the MAD B58 V2 4.5" Catless Downpipe for maximum airflow, power and sound. Constructed from high-quality 304 stainless steel, the catless design removes the restrictive catalytic converter to cut back-pressure, improve turbo spool and deliver a noticeable jump in power, throttle response and exhaust note.

Expect up to a 30 HP increase on a tuned B58 with stock turbos — even more on upgraded turbos. It's a direct bolt-on replacement that works seamlessly with the factory exhaust, and it includes a mounting bracket.

Features

• Large 4.5" catless design in 304 stainless steel.
• Includes mounting bracket.
• Compatible with right- and left-hand-drive vehicles.
• Smooth bends for maximum airflow with no drone, plus a flex section.
• Up to 30 HP on stock turbos — even more with upgraded turbos.
• Lifetime warranty on defects and fitment; 90-day return; ships in 1–2 business days; spot-on fitment.

Fitment

• 2015+ BMW M240i & xDrive
• 2016–2019 BMW 340i & xDrive
• 2020–2024 BMW M340i & xDrive (does not fit 2025)
• 2016+ BMW 440i & xDrive
• 2016+ BMW 540i & xDrive
• 2016+ BMW 740i & xDrive
• 2017–2024 BMW X3 M40 (G01) & X4 M40 (G02)
• 2019+ BMW X5 40i (G05) & X7 40i (G07), xDrive
• 2019+ BMW Z4 M40i (G29)
• 2019+ Toyota Supra 3.0L

Emissions disclaimer: This product is not legal for sale or use on pollution-controlled vehicles operated on public roads and is intended for off-road, race, or closed-course competition use only. You are responsible for compliance with all applicable emissions laws; use on public roads may violate the Federal Clean Air Act (42 U.S.C. § 7522) and similar state laws. Please check your local laws before purchase and installation.

Ships from our Vancouver shop — KORE SPEED is proudly Canadian-owned, with no surprise cross-border duties for Canadian buyers. Questions on fitment? Email support@korespeed.com.