Constructed of 3" stainless steel, the USP high flow cat offers huge performance gains at an affordable price. You can expect horsepower gains of 8-12 horsepower at the wheels and even more on modified cars. The high flow cat is completely bolt on, requiring no cutting or welding. Installation hardware is also included.

There is no welding or cutting necessary. The downpipe has a large 3" opening to take full advantage of the turbo flow and has the factory oxygen sensors positions. Typical gain is 200 to 400 rpm sooner spoolup and 40 ft/lb of wheel torque. HP gain is 10-15 on stock and K04 turbo and 30-40 on GT28RS or larger turbo. Our favorite when used with stock exhaust for ultra quite stealth sound. Key Features:- High grade 304 stainless steel- Mandrel Bent Piping- 3" Diameter piping to match K03/K04 turbo turbine outlet- Includes all hardware needed to install- Limited Lifetime Warranty. Application Guide: Fits 2002 - 2005 Audi A4 / VW Passat with K03, K04