I had similar results with GTM's test pipes it really comes alive under high rpms. My mechanic had to heat up the stock cat because one of the factory bolts were over torque and stripped. You have to get rid of the rest of the stock exhaust it's way to restrictive. Post some videos when you get a chance.
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2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 
2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling
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