I don't know about keeping the stock cats bro. Besides the fact that they are extremely restrictive and a set of test pipes doesn't cost much more especially when you've already invested so much. I remember seeing one vid on here of a member who had bad cats and trust me there was more than just "dust" coming out of the rear pipes. I personally would be terrified, one small to medium chunk of the cat filler will erase all your hard work and cost you a new turbo.
__________________
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
|