So you're wanting to put a stock GTP hood on your GT? If so, you won't gain anything. it's the same hood. If you're asking about putting an old Ram Air hood on, it will fit. They're all the same hood (SE, GT, GTP), just different front grills and facias with the SE and GT/GTP.
So yeah, it'll fit, just curious as to what performance advantage you're trying to get out of it.
ferb!