tuning ability and the nice lil bling bling screen to show off to the beotches haha, but also consider the cons..... some of the cons are that most people only look at the price of the v-afc and say "wow I can have my car tunedfor that much" But you have to incorporate install charges (if you are doing the install) and dyno time/tuning because you MUST get it dyno tuned, its not a plug and play type deal where you can mess around w/the settings yourself....