I remeber reading about what the base map will cover and not require initial re-tuning, they were; free flow intake, both cat's in place, and a free flow cat-back system. Well, I am about install my PFC but is my GReddy (Trust) duel intake a "free flow"? Now, I also have a cat-back system I want to install but without the pre-cat but origianl cat. I just want to know if what I currently have is basically covered by the base map with the above mentioned? At least enough not to require any real tuning just as of yet. Thanx for all your input. I've been doing some ready and plan to do more. Also ready about the wire cuts that have to be made.