The cheapest is Sargent(Alex) Peppers scan program. I think about 60 bucks?? Yu need a laptop to run it tho, an the price of the program, doesn't include the interface cable. #2, is AutoTap. It's about 200$ new, but, includes the cable. Yu need a laptop for it also. Yu can find these on the Nat. Board, quite frequently. Look in the PCM Tuning section..... http://www.grandprixforums.net/f65/s...aptop-911.html