Hay HRW, how do you like the hi-flow cat? What did it do for your car?stock header w/FC high flow cat, FC flex, and MBRP cat back.
same setup i have on my 5-speed. stock header/fc hfc/bosal flex/thermal. getting rid of the stock cat does A LOT in freeing up exhaust restrictions. i would consider it as important as a cat-back. definitely worth the money.