horsepower tips for '00 5.4 F-150

Thanks for the replies people. My truck is a flare side extra cab. It's my daily driver so I probably wouldn't go with the underdrive pullies. A Lightning blower sounds like a good idea though... You think there'd be any Eatons for sale on the site links you guys posted? I have my '90 Mustang w/ a rebuilt 306 & 150 shot if I want to go real fast. I was just looking to beat the Silverados that some of my buddies drive. They seem to pull me on the top end. If I did change gears I'd probably go 4.10s...but that would kill my gas mileage since I have stock wheels and tires on there. The 3.55 gears are actually ok. Hmmm...what to do? Guess I'll just go with some exhaust for now. Since you don't recomend a Gibson exhaust 95GTS...which exhaust do you recommend?