Thanks, Monsta. However, I guess I am being a little slow here because I have not found much of go-fast parts for the 4.6. I believe Procharger makes a supercharger for the 4.6, plus then I can install a cat-back exhaust, headers, an intake kit, plus a new chip. Is there anything else to do in the area of go-fast add-on parts? And, perhaps this needs to be a new topic, but what exactly is an intake kit? Are we talking replacing the intake manifold or just adding a hose and new air cleaner? If so, what does adding a new hose do for you? Headers are not my favorite add-on as my experience on Ford and Chevy engines is they give more problems than benefits: leaks, loosening of bolts, fit, heat, etc. Granted, I have not installed headers on a vehicle newer than 1974 and not since the early 1980's but still.... I have compiled a list of possible add-ons and modifications to make to my Expedition by reading a lot of the Posts on this forum so any info you can provide is helpful. Thanks. Andrew