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

Dinan's valved cat-back for the X3 M40i and X4 M40i replaces the factory single-to-dual layout with one larger, straighter pipe and a proper quad-tip finish. It keeps the factory exhaust valve, so the car can be quiet when you cruise and loud when you're on it.

What you get

• 83 mm stainless piping (vs 80 mm stock), with the factory resonator and collector removed.
• Muffler with drone-reducing design to keep cabin noise in check.
• Quad 3.75 in (95 mm) double-wall clamp-on tips with a laser-engraved Dinan logo.
• About 7 lb lighter than the factory system, by Dinan's numbers.
• Valve hardware for both pre-LCI and LCI cars, plus mounting hardware.

Good to know

• Dinan quotes up to +6 hp and +5 lb-ft.
• Bolts on in the factory mounting points with no cutting or welding.

Brand: Dinan · Part #: D660-0099

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.