hypertech makes one and i think j.e.t. does as well. they were pretty standard back in the day but now custom tuning for our cars have become common place. those plug in chips simpy firm up shifts, change shift points, increase timing, and what not. they are really not worth the $250 unless you have an AOD. A custom SCT dyno tune around my area is $600. I know SCT does mail order tunes but I have no idea how they work or how much they are, but again a custom tune is not worth it for stock or mild set-ups.