i would defintally get a radix over whipple. Check out prochargers. I had one on my truck and i had a whipple and the procharger has way more power and rund better to. BUt you honestly cant beat nitrous. I had a 150 shot on my truck and i spent like 400 on the kit and it was faster then procharger or whipple. Nitrous has alot of varibles but if you get it right youll get more power out of nos. you just got to know what your doing.
old set up: 2002 chevy 5.3, procharger 12lbs boost, asm headers, ls1 edit, flames, 20inch budniks
New Set up: 2004 chevy 5.3 ext cab, 12 inch twisted suspension lift, 36's, exhaust.
future mods: 150-200 shot, ls1 edit, air intake, stall, 5.13 gears, 12s or bust