FOR SALE is a DA-1 processor. This ECM is from an '88 5.0 liter Mustang. It is in very good condition and has never been tampered with. 1988 was the last year for Speed Density in a 5.0 Liter Mustang, and is the best Speed Density computer to use due to better calibration and more agressive spark and fuel tables. Plus, it solves some of the issues known to plague the '86 processor. Most people that have installed them in an '86 5.0 have noticed improved drivability, and an increase in performance. This is a great unit if you want to keep your car Speed Density and add a few bolt-ons for extra performance.