I ran a Megan RSX-S shorty, Megan RSX-S Resonated test pipe, and a CTR spec Fujitsubo RM-01a cat-back when I had my EP (my car in the vid below).
http://www.youtube.com/watch?v=l2wSr9djK1Y
It was fairly quite with almost no drone on the hwy, but it would still give you a little bit of great noise when going WOT. This header/testpipe setup dynoed 8whp/6wtq lower than with the race header, which was stupid loud.
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