Re: chips
Yes if you use the search feature here you'll see countless threads involving this chip.. as far as I know there were two versions one was a 93 octane street version and the other was a race version which required larger injectors and 100 plus octane I think.
The street chip which is the more commonly found one is simply a two bar map chip like stock with a few limitations and such removed from the stock chip.
Also the Pitbull uses open loop boost control. So it just tells your wastegate to go to x % of DC. You then adjust the wastegate arm to get that x % to match up with your desired boost level. It know I read somewhere that it was made with 16psi in mind even though it's a two bar chip.. so it's just coded to run a little richer.
Other than that, it has some minor tweaks, like limits removed and turn-on temps lowered and stuff. It's generally concidered one of the better and safer of the stockish 2bar chips. Of course im referring to the 137 version which I've used in my truck for at least two years and have had no problems except a rich condition here and there which was resolved.
This site also has some info on Pitbulls I believe
http://www.syty.org/old/promguide.htmls