It's actually on the drivers side in the gtr.
Don't drill it, just use pliers to take them out, look at one of hoses with yellow marking on them, that's where the restrictor is, squeeze that bit if you don't feel you can squeeze the tube, it means the restrictor is still in.
Yes, it's safe to run 14psi on stock ecu, with PFC/nistune, you'll benefit from extra power after tune.