BMW S58 3 Inch Catless Downpipes - X3M F97 X4M F98 2019-2026 - OneFastShop

Unlock the full potential of your S58 X3M or X4M with the OneFastShop catless downpipes. The factory catalytic converters are the biggest choke point in the twin turbo exhaust - removing both frees up real power, spools the turbos sooner, and brings out the aggressive growl these SUVs were built to make. Designed specifically for the F97 X3M and F98 X4M from 2019 to 2026.

Expect +30 to +50 horsepower with a supporting tune (more on big turbo builds), dramatically faster spool, and sharper throttle response. This paired set is a direct bolt-on with no cutting required, works with OEM and aftermarket cat-back exhausts, and is backed by a lifetime warranty on defects.

Specifications

What's in the Box

• 2x S58 catless downpipes (driver and passenger side)
• Grade 12 mounting hardware

Installation & Tuning Notes

Gaskets required: Two turbo-to-downpipe gaskets are required to seal these downpipes to your factory turbos. Our 3.5 Inch Turbo to Downpipe Gasket for BMW S58 is sold separately - add two to your order.

Tuning & check engine light: Removing the cats means the rear O2 sensors will eventually set a check engine light (a catalyst efficiency code such as P0420 / P0430) on an otherwise stock car. This is normal for any catless downpipe and not a fault with the part. To run them correctly and keep the light off, the car should be tuned with the rear O2 sensors turned off - any major S58 tuning platform supports this. We strongly recommend installing these downpipes with a supporting tune rather than on a stock vehicle.

Off-road use: Intended for off-road and track use only. Not legal for use on public roads and may not comply with emissions regulations. Check local laws before installation.

Fitment