CTS Turbo B6 Audi A4 1.8T High Flow Cat Pipe

CTS Turbo's B6 A4 1.8T High Flow Cat Pipe is the premier cat upgrade for your Audi. It seamlessly replaces the restrictive stock catalytic converter that sits immediately after the turbocharger.

The pipe features 3" stainless steel with smooth mandrel bends and two O2 sensor bungs, with the option to add a third. Expect substantial power gains, improved exhaust flow, and a throatier sound. You'll notice a flare near 4" that tapers down to 3", engineered to optimize flow as exhaust gas moves from the turbo into the pipe. It's one of the best bang-for-buck upgrades for A4 owners, and it's an attractive piece. Each 3" cat is mandrel-bent and hand TIG welded.

Fitment

• 2002-2005 B6 Audi A4 1.8T

Product details

• T304 stainless steel construction
• Mandrel-bent stainless steel
• Fully TIG welded design
• Optional third O2 bung available
• Install hardware included

To clear the CEL that will occur, proper tuning software must be used — Stage 2 software is strongly recommended.

Emissions disclaimer: This product is not legal for sale or use on pollution-controlled vehicles operated on public roads and is intended for off-road, race, or closed-course competition use only. You are responsible for compliance with all applicable emissions laws; use on public roads may violate the Federal Clean Air Act (42 U.S.C. § 7522) and similar state laws. Please check your local laws before purchase and installation.

Ships from our Vancouver shop — KORE SPEED is proudly Canadian-owned, with no surprise cross-border duties for Canadian buyers. Questions on fitment? Email support@korespeed.com.