the valves are basically the same thing but you have to use either as a bypass valve becuase of the maf, if you don't bypass the air( recirculate the air) your car will run like **** if at all, it has to due with the computer thinking the air is there but if you use the blow off ( atmosphere discharge) it confuses the computer.
sorry for the choppy explanation i am in a taking a lab quiz right now.
the valves are basically the same thing but you have to use either as a bypass valve becuase of the maf, if you don't bypass the air( recirculate the air) your car will run like **** if at all, it has to due with the computer thinking the air is there but if you use the blow off ( atmosphere discharge) it confuses the computer.
sorry for the choppy explanation i am in a taking a lab quiz right now.