I am new to the pontiac Gtp world and was wondering where a good place to find performance parts would be. I have been looking at underdrive pulleys for awhile now and was wondering how many pounds of boost a stock motor can hold. i have a 2000 pontiac gtp. Also i heard about somehow making the supercharger whine louder. IM not sure if this is true and if it is i was wondering how to do it any halp would be appcreiated

Thanks
Dan