You're not going to see any major gains because the stock cats are very restrictive, suggest you get a set of hi-flow cats. I did the straight pipes to the muffler setup, it yielded gains but then again I had long tube headers as well. However, it sounded extremely raspy, "tinny," and while it was loud it sounded like a lawnmower on steroids. I would definitely like to hear how it sounds without the muffler, Flush...got any vids?
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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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