mine is a dual stage NX setup, i will be going DP for the 414 i'm building though on an LSX manifold. as far as the tuning, what i would/will do is have edit on my lap top, have my tuner Chris Robinson at RPM in Lewisville, TX tune it for performance for NA, as well as N20, and when i'm gonna go to the track and spray, i'll load that tune and when leave i'll load the NA tune. pulling timing is the main thing from what i've always heard with n2o, like 1 degree for every 50hp of nitrous or something to that affect.