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the average SOHC turbo with the right turbo sizing will easily run low low 14's. My buddy has a stock motor EX coupe with a RHB5 turbo on only 7psi & he runs right with my friend SRT-2 & my other friend I/E S2000... So I would guess it would prolly be fair game for a 99+GT. But some people oversize the turbo on these small engine & they dont move for crap