Not sure which one your buddy has but its prob. one of the more expensive ones out there.
The 3 most common I've found are Edge Evolution, PHP's Gryphon or something from SCT.
I personally have an Xcal3 from SCT. It currently has tunes loaded on it from Justin at VMP. In the past I have had tunes from Mike at Troyer Performance. Getting a programmer is more cost efficient than just the chip. The programmer will let you datalog and clear trouble codes.
Best starter combo for gaining some hp/tq and mgs is a programmer, tunes, Cold air kit and e-fans. You could also add in an UDP.
97 XL 4.2L V6 Reg Cab Std Box 4r70w 3.73 TruTrac LS, General Grabber UHP 265/70R16s, Line-x spray-in bedliner, Truxedo Deuce tonneau, 20% tint, AF1 CAI, ASP UDP, Magnaflow catback SIDO, Magnaflow Hiflow Cats, Port & Polish 1/2 shaft TB, Troyer tuned.
Whaddya mean I don't pay my bills??
Whyddya think I'm broke!!
163.17 rwhp 231.59 rwtq (94 tune)