High Flow Cat?
I commute in my GT-S, so I don't want significantly more noise, but would like a performance increase. From reading the forums, it appears that the major bottleneck is the cat, not the muffler. Isn't a high flow cat what I'm looking for, and is there such a thing for the GT-S? I found a Magnaflow, but is it really higher flow than stock?
Additionally, I live in Denver, so the car has to pass emissions and a visual cat inspection. I can't just install a pipe. I'm guessing this car might just pass emissions with just a pipe, but they visually verify the cat is in place.