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This may not help much, but...

My Magnaflow catted x-pipe provided my '01 GT with more hp and torque throughout the rpm range. More so at the top - 8 rwhp / 14.4 rwtq, avg 4 rwhp / 5 rwtq gain between 2000 and 3500 rpm then it takes off (information from dyno - if you couldn't tell). The sound is pretty nice. I'm running the stock cat-back right now, but I'm ordering a set of Magnaflows in the next couple of days. Sorry I don't have any sound clips or pics.

Almost forgot - installation took about an hour and wasn't all that bad - fit as well as the stock h-pipe.
 

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Oh yeah, @ about 4000 rpm big difference! I'll let you know when the catback is installed.
 
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