Installation was relatively easy (except for the lower heat shield screw and the throttle body bolts). But everything was described in detail in the instructions. This is the 4th. AEM system I've installed (I also have 2 Mustangs, and used to own an '00 S-10 P/U). They look great, and perform well. Haven't seen any mileage increase, but have noticed more power! I'd buy a 5th if they only made one for my '98 Ford van with the 6.8L V-10, hint hint!