I would recommend going with the mods and keeping your stock pieces. If you run into any concerns down the line it will be a pain in the a$$ to put the stock pieces on but allow you to go to the dealer for engine warranty issues without them being the wiser.
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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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