Welcome to the forum
WP-any wp w/a metallic impeller will suffice. Most go through NAPA, I was able to get the prestone wp, through a local midwest autostore.
Headers-MSDS, but you will need a MIL eliminator, since it will throw the check engine light at you.
For all your performance questions see the duratec performance sections. Most likely all your questions have been asked, so be sure to use the search button and the FAQs and How-to's.
