you are going to be ungodly loud. I ran Long Tube headers with straight pipes to the stock muffler and its ridiculous, I'm talking extremely illegal ridiculous. However I can drive it quietly when I want. I'm pretty raspy but your "chambered" pipes should get rid of that.
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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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