Hello, just purchased a 07 427R Roush with 22,xxx miles down in Missouri. I believe this car came from Oklahoma didn't know if anyone has ever seen it or know the owner? Well first things first whats the best first step to take on these? From what i have seen a smaller pulley, program, and plugs? any input would be appreciated. Also i have a check engine light for the cats we do not need cats in Illinois, performance wise would i be better off to remove it or do something else?