CTS Turbo 4.5" High-Flow Cat - BMW B58 (all generations, RWD and xDrive)

CTS Turbo's high-flow cat takes the place of the factory B58 downpipe, swapping its restrictive converter for a 200-cell unit that lets the exhaust leave faster. The result is more flow for power gains and a sportier note that stays quiet when you're just cruising.

What you get

• 200-cell high-flow catalytic converter in place of the restrictive factory one.
• T304 stainless steel with hand TIG welds, back-purged for long service life.
• CAD-designed fitment that sits where the factory downpipe was, and was test-fitted on a real car.
• Livelier exhaust sound that stays subtle at cruise, with no drone when paired with the factory exhaust.

Good to know

• Only fits cars without a GPF/OPF.
• Stage 2 engine software is needed to avoid a check engine light. CTS does not cover catalysts damaged by crackle tunes.
• CTS Turbo sales are final and returns are not accepted.

Brand: CTS Turbo · Part #: CTS-EXH-DP-0024-CAT

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.