Fabspeed Catted Downpipe - G20 M340i

The factory B58 downpipe uses a 700-cell ceramic catalytic converter, and that dense core is one of the bigger restrictions after the turbo. Fabspeed's Sport Cat Downpipe swaps it for a much freer-flowing converter while keeping a cat in the system, so you get more exhaust flow without running catless.

What you get

• HJS 200-cell cat. A German-made trimetallic converter that Fabspeed lists as Euro 6 rated, and the largest cat it says will fit in the factory location.
• 4 in piping ahead of the cat, stepping down to 3 in tubing behind it to meet the rest of the exhaust.
• Mandrel-bent T304L stainless steel, CNC formed.
• Bolt-on install that needs no cutting or welding.
• Fabspeed lifetime warranty.

Good to know

• Fabspeed guarantees no cat-related check engine light, provided the engine and its software are healthy and properly tuned.
• Fabspeed says further gains are available with a tune.

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.