I think the GT Haus is 2.5" at the inlets of the Y pipe and for sure 3" at the connector then 2.5 to the muffler.
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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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