i just put in the j/a it was easy to do i have a 03' crew cab short bed with mbrp 4"exaust and volant intake. i have tried all 5 power levels. on level 3 i ran a 7.0 0-60 and a 15.7 1/4mile w/ 2 other people. levels 4-5 are nice but 5 is a little scary from reading the stories from the people on here. but even at 3/4 throttle it spins brand new bfg all terrians! anyway i just wanted to tell every one thatr doesnt know that the edge juice with attitude is the best thing u could buy for this thing imo. i almost injoy this truck as much as my 95 supercharged 6 speed impala ss.:ro)