Why did this happen?

[Blue50]

Actually, he lives near me (like two blocks away). I saw him changing the oil in his car when i was walking to the train the other day. I started talking to him, and he seems like, Get this, PRETTY DECENT DUDE. Not your typical camaro driving *******. He has Stock exhaust manifolds, Flowmaster cat back, ported plenum, 5.7L tpi, and, a 150 shot of NOS! That's how he got me, that bastard!!!! Anyway, he is a cool guy, and he gave me a ride to the train in his IROC. I must say, i am surprised. These IROC's are not that slow. It was torquey as a mofo. I honestly think that even though he has an auto, it would be a pretty fair fight between my stang and his roc. On juice, he would kill me, as he did, but i think that i want juice now also. He said he hardly as any mods in his car, and the nos is all any street car needs to go fast. Is he right?? Anyway, which nos kit should i order for my stang. I want to beat this guy.