a 99GT makes 260hp at the flywheel. A 5-speed will lose around 18% through the drive train. So to get 300rwhp your gonna need around 355 hp at the flywheel. An increase of around 95hp. I would say a blower would the the best way to go to make this kind of hp.
Torinalth : A "bullit intake, long tube headers, strait through exhaust, pullys, and upgraded ignition system with a bit more fuel..." isn't gonna net you 300rwhp. Not even close.
And your estimates for the blower are on the high side. To get 375rwhp the 4.6 would have to make around 440hp...an increase of 180hp. Your not gonna see that with blower added to a stock motor.
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1987 Buick T-type
1998 HD Electra Elide
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