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no stock grand prix runs 13s also even the 2000 body style gtps only ran 15 flat cuz they only made them autos. i have a friend with a 97 SOHC and he has intake,header,exhaust,ecu,cams,and underdrive pulley and he runs upper to mid 14s so you do not have to go FI to break into the 14s.
There is no way your gonna be able to get the car into the 14's all motor and then have the right motor set-up to bolt a turbo on later. You are gonna have to change a lot of things when you decide to go turbo. If a turbo is the route you want to go then start saving money and buying turbo parts.