ok, Right now I'm running the afc hack set up with no check valves and stock MAP sensor. THis winter i'm switching to überdata, I've heard about GM 3 bar MAP sensors, do I need one, and do I need check valves? I"m planning on running 9psi on a 14b.

 

Nope, you don't need the 3bar map uless you plan on running over 11 psi and need to expand your fuel/ignition tables. No check valves either man. You'll be fine with the stock map sensor.