The Greddy exhaust is 2.75" in diameter whereas I think the indivia is 2.5. It depends on what you want to do long term. If you plan on going turbo or SC probably get to get the Greddy especially with a TT setup otherwise if you just want a change in sound and a few extra hp get the invidia.
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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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