I remember somes years back,70's, when Chrysler had a high performance manual out,on what parts worked,to get your Mopar into the 14,13,12,and 11 second and quicker. It was all in the book,on what was needed. That's what the Ford engineers need to do for these new GTs and Cobras. They know we have fun with these cars on the street and strip,so why not a guide book? It would take the guess work out of what parts really help performance,and explain how the computer contorls the different aspects of engine performance. They used to update the manuals every year.