I had a testpipe but got rid of it. Its awful. Makes the car smell bad sound terrible but the good was it was a nice little upgrade, no interupted exhaust flow at all hehe As far as the highflow cat. Go with it its about as good as a testpipe, but it wont do the things listed above. Plus the testpipe is illegal.

 

aem cai
dc sports 4-2-1 headers
hi-flow cat
aem tru-power pulleys

screw all that.. spend a little more for turbo.