The MAD X3M/X4M Catless Downpipes are the ultimate upgrade for unlocking power on your S58 SUV. Mandrel-bent from high-quality stainless steel, the catless design removes every restriction for more power and an aggressive exhaust note.

They're a direct bolt-on replacement for the factory cats, 100% hand- and TIG-welded for durability, and work with the factory exhaust or aftermarket systems.

Features

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

Fitment

2019+ BMW X3M & X4M (F97/F98).

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.