I Just installed 1600cc secondaries with a new fuel rail. I am trying to adjust the aftermarket sx FPR but it is stuck at 45 psi. How the hell do i adjust it.

 

If all the plumbing is connected correctly, and the FP diagnostic pin is grounded to the ground diagostic pin, and the ignition is turned on but engine not running; just turn the FPR adjusting screw in or out. If the engine idling, remove the pressure line fronm the FPR so it senses 0 psi.

Otherwise you have made an installation mistake.