autologic all the way. My autologic chip can be programmed up to 4 different setting. I dont' know if diablo can do that. All the fast n/a 4v racers use autologic. check out the dohc forum. Bob cosby, Jason Miers, yours truly I know that Tony(need for speed) can tune the car right on the dyno. I can think of anyone who has diable software "in house." I remember awhile back that diablo wouldn't release the software to Steve(Tune Tec) so steve gave up on mail order. .02$ -Mark