Pressure boxes add power this way, and is why so many remove them and get a custom tune with EFILIVE. The power is very uneven and spotty.Put the egt gauge probe near the bottom of the down pipe, got the egt and boost gauges installed in the pillar mount, set the six gun on 3 so it can learn it in time to tow this weekend. On 3, with the speed loader, it's working now and man does this thing scoot! It's kind of uneven when it starts adding power, seems like about halfway through each gear it really starts to pull hard. Haven't owned a diesel in a couple years, (although I drive heavy commercial everyday) but it takes a little getting used to being at such a low rpm but having so much acceleration. Not even WOT and half the rpms my Camaro would be turning, but from 40 to 70 the speedo needle is almost a blur. Pulling about 22-23lbs of boost peak, without really pounding on it.
If you buy a V2 with the GM tuning suite it will run you $899 and comes with 2 VIN licenses to tune two different ECM/TCM combos(EFILIVE licenses to the serial number in the ECM, not the VIN number). Additional VIN licenses are $125 each. I have alot of tunes for stock trans LB7's, so you could go by and ask him what he would charge to flash one in for you. I would reccomend a DSP2 tune which is no extra work to flash in, just requires hooking up a toggle switch to ground to the ECM to trigger the tune change(I do NOT reccomend DSP5 tunes for LB7's as that is a GOOD way to limp your trans).I have a friend who does EFI live at his shop, idk if he's done any diesels, or how much he'd charge. I've heard EFI live is big money.