[Richard L]

The checkvalve should alawya be as close to the jet as possible.

Your pre-throttle shoudl ideally be place at the exit of the IC (FMIC). But you might consider placing it post IC if oyu have a top mount.

I would leave the restrictor out completely on your install if you are using multiple jet. This is becuase there are more twists and turns to impede the water flow.