Yea im wondering too... i do want to do a little bit to my ls1 when i get it, but its not a race car, you gotta strike a balance between dependability/fuel economy and speed. If it hurts gas mileage significantly, its a no no. As long as i can beat hemis (i know this wont be a problem) and lightnings and most ricers ill be happy. Just curious sleeper being as your LightningKiller also, what do lightnings run? how bout those 04's? And what setup are you running sleeper, i dont guess youve updated your sig in a while, pics would be awesome if you have some (exterior of the truck too).