I have a 2005 GTP Comp G and I want to start modding it. I have read the "how to safely mod your 3800" post but I have some questions still. Does anyone have a link to detailed instructions on making your own cold air intake, I can't seem to find one. Also what are the benefits of new spark plug wires and a 160* tstat? How hard are headers to install and what kind of HP increases can I expect from them?