I think after the exhaust and down pipe i'll go for the efi live.
Now going with out a muffler do you get that (not sure how to explain it) detoning noise in the cab were your head feels like its rattling? As long as theres no serious cab noise I'll go with out muffler.
My other question is how hard is it to install down pipe? Is it just bolt on? Can be done with one person? Id rather not have to have the exhaust and dp done by mechanics but im pretty sure if i do decide to do it, i'll be on my own. From what im told the 5' is a tight fit and probably kinda heavy and seeing as i dont have access to a lift im sure the task could be rather hard.