I'd rather go with test pipes. In NY you'll pass inspection unless you have a check engine light, just make sure you go to a shop you are familiar with so that they don't do a visual inspect, which they probably wont since it requires lifting the car or climbing underneath. I have posted a vid on this forum of test pipes with the stock exhaust on a dyno, should be around somewhere.
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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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