I have a 2000 GTP with the series II 3.8 and it's not stock.
First off, whoever says modding is stupid just because it's a heavy boat of a car with no handling is ignorant. Why not take advantage of one of the best engines ever made when it has a roots blower on it?
Definitely don't put a 3.0" pulley on the car stock, or even with decent exhaust work. You will chip a piston, and there goes your engine. Contrary to popular belief, even a 3.4" pulley on a stock car can easily chip a piston.
My mods are a 180 degree t-stat (stock is 195, and 160 is too cold since the car will never fully warm up), autolite 104s (yes ford plugs in a pontiac lol), a 3" downpipe (versus about 2.25 stock), a wizaired cold air intake with 9" k&n cone, a DHP v.1 pcm (raised shift points to 6k, firmer shifts, a few more degrees of timiing, etc. and a very proven pcm for the 3.8s), 1.84 ratio roller rockers, and a 3.4" supercharger pulley (stock is 3.8). Stock I ran a 14.9 @ 93.5. With the mods it hits 13.5s with absolutely no prep, in full street trim. Drag radials and a little tuning of the fuel with a MAF translator would net me low 13s easy, with a tiny $700 in mods.
If you wanted an easy 11-second car, they make turbo kits. If you want easy and inexpensive 12s, they make full size intercoolers and there are very nice cam grinds available.
For more info, visit clubgp.com. Stay clear of 3800pro, it's a crooked company (Intense Interprises). For mods, visit zzperformance.com. They are active in the GP community and back their products.
Have fun with it man, it might not handle like a contour, but it can easily have tons of horsepower.
