The MAD F90 Primary Catted Downpipes are the upgrade for unlocking the S63R's potential — more power and torque across the rev range, with a deeper, more aggressive note. Mandrel-bent from T304 stainless steel with smooth transitions, they minimise turbulence and improve exhaust gas flow for real, measurable gains.

Installation is simple: they bolt directly onto the factory exhaust with no cutting or welding, and include all necessary hardware and gaskets.

Features

• 200-cell high-flow catalytic converters.
• 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 for durability.
• Lifetime warranty on defects and fitment; 90-day return; ships in 1–2 business days; spot-on fitment.

Fitment

• 2018+ BMW F90 M5
• 2019+ BMW F92 M8

Note for Euro 2021+ LCI vehicles: please confirm your downpipe style before ordering. These fit vehicles equipped with OPF filters, but your current downpipes must use a V-band slip-style connection, not a flange/2-bolt design.

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.