and which you cannot use those in an s4..it fights the ecu..car runs liek *** and spikes all diferent psi's..get a n75 and a good chip and you will be straight..if not get a vag and mess around with some stuff...

 

I'm sure that would work fine in parallel to the N75, but it's 100 dollars. I bought the vast performance valve for $40 and it works great. The needle jumps to 16psi and stays steady until it starts to ramp down with high RPM. I'm not knocking forge. The valve is a visual work of art, but the bleeder doesn't make sense to me. You have to have a check valve to limit.