Originally Posted by bbyevo8u

i have the perrin tbe and i love it! muffler looks stock and even sounds stock with the hfc off boost but once you go into boost its f-ing loud, i like it that way! i just replaced my hfc with invidia test pipe, the car sounds the same at idle but not when your driving in or out of boost but its still not that loud.. test pipe= i lost a little power off boost but gained a lil up top. hfc= quiet with good low end power & still flows almost like a test pipe. but if you have a ix it will not clear the under brace bar so you need to put some washers on the bolts to lower the brace or buy aftermarket brace.

Originally Posted by shadow1

A few washers is all that is needed.