so, is this a definate occurence that happens to everyone, yet you are the first one i've seen talk about it? everyone else who has run one in drag must just be too ashamed to admit it, then.......... i don't know your experience, but it could be possible that you were running a high output coil, which they don't always like.....the circuitry is designed to increase the output of a stock coil. also, never being at all interested in racing, i have found the dyna fs programmable very much worth the price. but, i'm not simply doing a mild build, either. even though, i went ahead and put it on a somewhat mild build with just bolt-ons this spring, and it was a night and day difference to pick up some lost top-end, without having to sacrifice the low-mid punch from advancing. i'm sure i'll be more than happy with the custom curves i'm going to be putting in there.....