Ok since this is in reference to the amount of boost i plan on running and stuff. What i want to know is how accurate (on average, and assuming they are a good programmer) does the custom tuning tend to be when using a diablo chip for such things as remapping air/ruel ratio's? and timing retardation at certain rpm's? I know that when you get a dyno tune it is really accurate. But when you first order the chip usually you just give the programmer a list of your mods and such and then they go from there. Would you think this would be close enough to not hurt anything when i run it for the first time with my new stuff? Or would a dyno tune be needed immediately? I mean i know they cannot get everything perfect on the first shot but just how close can they come with just getting an accurate list of your mods and boost numbers and such and burning a chip for that? I know i kind of restated my question about 3 times already. :-D but i just want to get my question out to someone without them having any wonders of what i am asking. Thanks. Robert