These are great questions that should be asked on the open forum so other members can benefit from the answers. I don't know if you would want to go the route of a Hemifever tune as they are more aimed at the racing crowd. The catch can is very important especially if you are going to run a tune. By removing the oil residue in the PCV system it helps keep the fuel octane consistent. It is an absolute requirement if you are getting a Hemifever tune.
I have a 5.7 with k&n cai and exhaust i want to programe it but thats where im stuck i was looking into a superchips but then came acrossed the sct hemifever whats the better of the two? Its a daily driver i would like to see more mpgs and of course tq and hp, ive also been ready about catchcans? What do these do and does it apply to my truck?