The Pittsburgh power mopdule is 100% worth the money. Those guys know what they are doing.
We have one on the short trip semi at work. Its a 07 T800 KW with a 550hp C15 CAT and an 18spd. The 550hp apparently wasnt enough so on went the Pittsburgh power module.
Ive only ridden in it a few times but all I Can say is wow. We had it loaded down and went to climb the bluffs and bumped it to level 5 and it shot up the hill with 62psi of boost and just as we reacdhed the top it hit 1,000* EGT. Very little smoke the whole time, actually none.
Then for shits and giggles he bumped it to level 7 as we left unloaded and It didnt look like he could shift fast enough.
Normal driving is done on level 3.
It is a great module and I would reccomend it to anybody.
The Ts Performance MP-8 is good too and much cheaper and easier to install, but doesnt give you near the results of the Pittsburgh power module