ok everyone in here says that the 5th and 6th ports in s4 n/a's open from backpressure in the exhaust and split air tube correct??? well what im wonderin is how would the actuators open from back pressure from the split air tube if it has a check valve. check valves prevent air from coming back in right?? so theoretically it wouldnt be getting any pressure at all from that tube. or does the tube just create more pressure in the exhaust causing them to open from the pressure in just the exhaust???





jay

 

the 6 ports get their signal before the check valve.

it goes main cat--> split air pipe--->6 port tube--->

check valve--->intake--->acv