I just found out I've been running lean for almost a year with a 55 shot of Nitrous. It turns out the person who installed my system tapped into the FPR and the damper (looks exactly like the FPR). After looking through my Nissan Repair manual I found out which one I was suppose to tap into. If you are looking at your engine from the front of the car, the FPR would be the one furthest away from you. Please feel free to e-mail me if you have any questions. I want to make sure no one else makes the same mistake.

 

The FPR is right under the throttle body, near the knock sensor. Where exactly is this dampner?
-hype

 

On the 5th Gen, it's not located under the throttle body, it's a few inches in front of the throttle body. The damper is about 4 inches from the FPR.