CTS Turbo Race 4" Downpipe BMW N55 (Electric Wastegate) X4 M40i

The CTS Turbo catless downpipe for the BMW N55 (electric wastegate) is built to maximize exhaust flow for the highest power gains. Do not let factory parts hold back performance and sound — unleash your BMW's potential. CAD-designed to drop perfectly into the factory location, it is hand TIG welded from T304 stainless and back-purged for years of reliable service. This listing is the X4 M40i application.

Product Details

• Designed and validated on a real car in real-world conditions
• T304 stainless steel, TIG welded back-purged construction
• Replaces the restrictive factory downpipe
• Big power gain with no loss of refinement
• Sporty exhaust tone that stays subtle when cruising
• No drone with the factory exhaust

Proper tuning software must be used to clear the CEL that will occur; a Bootmod3 downpipe software upgrade is strongly recommended. For off-road use only.

Application Guide (does not fit RHD vehicles)

• BMW X4 F26 M40i (2014-2018)

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.