Snow Performance Throttle Body Spacer Injection Plates are the easiest, best selling way to mount water-meth or nitrous nozzles on your Subaru WRX STI 2.5L. Simply fit between the throttle body and intake manifold and enjoy custom placement of two 1/8" NPT ports. Warning! When using a throttle body injection plate a solenoid upgrade part# 40060 must be used to prevent vacuum siphoning.