Fabspeed BMW B58N Sport Catalytic Converter Downpipe (2023+)

This downpipe feature German made HJS 200 cell EURO 6 compliant trimetallic catalytic converters. We use 4 in piping from the engine side to the cat, and 3 in tubing from the cat to the rest of the exhaust. Our larger catalytic converters are better because they allow for more exhaust flow and the increased catalysts surface area allows for better exhaust gas filtering which means emissions compliance that will NOT trigger a check engine light. Our Sport Cat Downpipe are a direct bolt-on replacement for the factory catalytic converter. (OEM: 18325A04CB2) When we looked at the factory 12” long 700 cell ceramic core cats we immediately found an opportunity for improvement. The OEM Cats restrict exhaust CFM flow, limit sound and worst of all, rob performance.

Brand: Fabspeed · Part #: FS.BMW.B58N.SC

For off-road / competition use only. Not legal for use on public roads in the United States, including California.

• Ships from the brand or distributor, usually in 3–7 business days.
• Free US shipping on orders over $250.
• Unused parts can be returned within 30 days. Some items are marked no-refund in their description.

Full details are on our shipping and returns page.