If your putting on a PI intake, you need PI gaskets (unless i am reading this wrong or something) I got mine from the dealer for i think 35bucks.. i would NOT re-use your other ones.. some people say that you can re-use them but for 35bucks i rather not take a chance.. the manifold isnt all that hard of a swap.. but i think its much easier with another person handy.. (oh and yes you need the PI gaskets from 99-04)