so, i'm working on fixing up my daily driver...just for fun, it's a swb/reg cab silverado with a 4.8 and 3.23 gears. currently, it has true dual flowmaster 40 series 2ch mufflers, a hypertech power programmer III,and i've got a volant intake in the mail. i decided on the next few mods being headers, an underdrive pulley (SLP), and 3.73 gears. my first question is what do you think my truck would run a 1/4 with these mods? is there anything else i'm missing short of a cam to get cheap horsepower? and how badly do header bolts back out on the 4.8's?