Dinan Valved Cat-Back Exhaust, Black Tips - BMW X3 M40i / X4 M40i (G01/G02)

Dinan's valved cat-back gives the X3 M40i and X4 M40i a stronger B58 sound without losing the option to quiet down. With the valve open, the exhaust flows nearly straight through; with it closed, gas is routed through the muffler. Dinan removes the factory resonator and collector and replaces the stock single-to-dual piping with one larger pipe, and rates the system at up to 6 hp and 5 lb-ft.

What you get

• T304 stainless steel, TIG-welded.
• Valved design that switches between a straight-through path and the muffler.
• Quad outlets with black tips.
• Factory mounting points, with no cutting needed to install.

Good to know

• Dinan says this exhaust is not legal for use in California or states with similar rules.
• A Dinan exhaust valve remote is sold separately if you want to control the valve yourself.

Brand: Dinan · Part #: D660-0099-BLK

Ships from the brand or distributor, usually in 3-7 business days.

• 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.