Ok, so I've been trying to get my build ready for my 11 5.0. Ive came down to that I'm going to be running the Stage 2 intercooled P1SC1 procharger. Also ill be converting to E85.. Ill be running ARH long tubes with off road 3 in x pipe. I am not familiar with long tubes or headers at all even. I am trying to figure out what size primaries i should be running wether 1-3/4" or 1-7/8" ... my car is mainly a street car. help me out with some advice on which would be the better option, or if there is a better option.