The NX F&F kit is definately 110% :ghey: , I personally have a ZEX kit & it kicks ass. Best choice for a first time kit, I think, but NX is by far the most innovative nitrous company out there. Although they made a mistake agreeing to make the F&F shit, their products they have come out w/ since then are awesome. I'll go w/ them next time. Not much experience w/ NOS, just keep hearing it's not safe enough, but I could be hearing wrong.