Valvetronic Designs BMW GEN3 B58N 400 Cell Catted Downpipes

The factory catalysts on the newer B58 limit exhaust flow and how efficiently the turbo works. Valvetronic Designs' catted downpipes use 400-cell high-flow converters to cut backpressure, quicken spool and give the exhaust a deeper tone, while staying within emissions standards. They make sense on both stock and tuned cars.

What you get

• EPA-compliant 400-cell high-flow catalysts.
• Mandrel-bent tubing with smooth internal transitions.
• Precision TIG welding made to handle high exhaust heat and boost.
• Bolts on at the factory mounting points.
• Designed to pair with Valvetronic Designs exhaust systems.

Good to know

• Expect faster spool, more mid-range torque and more room for higher boost than the factory catalysts allow.

Brand: Valvetronic Designs · Part #: BMW.B58.GEN3.FF.400C.BR

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.
• Shipping is charged at the carrier's rate, shown at checkout. Orders over 70 lb ship by freight for a flat $99.
• 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.