Just recently installed Invidia Q300 catback exhaust with stock cats, will say that I feel a difference in power, especially when I put my foot on the gas. However, I want to increase the volume of the sound. Wondering if I should just install some test pipes, but unsure what to go with. Was looking into Berk, ISR, and Fast Intentions if anyone could give some info on those.

 

Hundreds of threads on these topics. It will be insanely louder with test pipes, FYI.