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If I do a pi head swap for my 98gt, does it require anything special or extra to do to the engine? Oh and Iam also sorry for some of the stuff I said yesterday, it's just that iam new to this site so please forgive me.
The Pi heads, cams, cam sprockets, pi valve covers, pi intake manifold, pi radiator hose, and a few other nig nugs... i'm sure someone will ring in on the rest.
Oh nevermind then I would also like two know if I should buy underdrive pulleys or would a diablosport tunner give me more hp??
No, the sole purpose of the handheld tuner is to lower your horsepower as much as possible. Mine worked pretty well. I dynoed 230 RWHP before the tune and 130RWHP after.
But on a more serious note. A good tune comes highly recommended with the PI swap. You might want to get a tune from MPH for such an application....