The stock computer will work, but it will require a tune using something along the lines of Moates QuarterHorse, SCT eliminator chip, or the Tweecer. Alot of good things have been said about the Pro-M stand alones, but at 1999.00 dollars it isnt cheap. But apparently it comes tuned and setup up for a true plug and play experience. It inludes a new harness, maf and the ecm. A less expensive setup is the Megasuirt PnP. Its around 740 dollars and the stock harness plugs into it. It comes with a base tune for a stock mustang that needs to be tuned for your setup. If your not interested in learning about tuning, you will have to find a tuner that can tune it, and there arent as many tuners familiar with it as the SCT and moates options. Other options include Haltech, AEM, FAST, and the Holley standalone. There is also the Anderson PMS units that are stand alone and they also have units that piggy back off the stock pcm. You can also try using just a calibrated MAF with injectors, but you will need something still to pull timing out, such as a boost timing retard box.
