For an NA EJ20, yeah not a bad idea...have a bit of fun with it, make it go as hard as a WRX, etc etc..

With a WRX, waste of time....for the cost of a PROPERLY setup 50-60HP Nitrous wet system, you can shop around and buy an ECU, Turbo, etc...and have it make the same sort of power without having to resort to running nitrous.

Its not NOS by the way, NOS is a brand. Nitrous Oxide is the proper term