To be honest I definitely think the ART's will be superior over stock cats (isn't everything) and many test pipes out there but I've already bought proven long tube headers and I don't see any potential for huge differences. However I still need a catback and I'm going to wait on motordynes offering.
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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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