OEM y pipe is 2". Your list is incomplete because piping inlets and outlets can differ at different parts of the exhaust. Also, I believe its already been mentioned that GREDDY ti-c is 2.75" and very loud.
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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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