$ub$sonic check out the trifecta tune threads about that in the "Bad New Racing" forum, i believe there is a thread specifically about that question. one of the big advantages of their tune is that it is not detectable by GMs scan tools, but it must be flashed back to the stock tune before going in for service. luckily you will have your stock tune on your lap top and afterwards you just flash back your tune.
-tyler