I installed the ford racing conversion kit about 4 years ago and haven't had any problems. It was expensive, around $600, but it was plug and play. Only took a few hours to complete. Came with a new computer, harness adapter, mass air meter, and air inlet tubes. There are other aftermarket brands also. A lot of people on here like to piece them together with donor parts, but you have to switch pins on the eec harness. Im sure others will tell you how that works.