Top end gains will be minimal, maybe even slight loss but you will have hp and tq gains through the powerband. Get a tune with the plenum and enjoy yourself. Do not wait for the GTR plenum, it is a ways away and will be a very involved install.
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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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