CTS Turbo 4.5" High-Flow Cat for BMW B58 1/2/3/4/5/7 Series RWD & XDrive - All Generations

Unleash your B58-powered BMW with the CTS Turbo 4.5" high-flow cat. Engineered to drop in where the restrictive factory downpipe sits, it maximizes exhaust flow for the biggest power gains while keeping a high-flow 200-cell catalytic converter in the system for a clean, streetable note.

Why it works

• Precisely designed and tested on a real car in the real world
• T304 stainless steel, TIG welded and back-purged construction
• Replaces the restrictive factory downpipe with a high-flow 200-cell catalytic converter
• Incredible sporty exhaust sound, subtle when cruising
• No drone with the factory exhaust

Fitment

• 2016+ F20 BMW M140i
• 2016+ F22 BMW M240i & M240i xDrive
• 2016+ F30/F31/G20 BMW 340i & 340i xDrive
• 2016+ F32/F33/F36/G22/G23/G26 BMW 440i & 440i xDrive
• 2016+ G30/G31 BMW 540i & 540i xDrive
• 2016+ G11/G12 BMW 740i & 740i xDrive
• 2018+ G01 BMW X3 M40i xDrive
• 2018+ G01 BMW X4 M40i xDrive
• 2019+ G01 BMW X5 40i xDrive

We recommend replacing the downpipe gasket on install — factory BMW gasket 18328612538 is required (not included). Catalytic converters damaged by a crackle tune are not covered under warranty. Stage 2 software is required to avoid a check engine light. Only fits cars without GPF/OPF.

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.