I raced a guy around here with my NA when I had it. We were even until...oh about 3/4 of the way through 2nd, when his damn vtec kicked in. It isn't a joke on those new i-vtec motors. It was like he had a friggen turbo on it. He just pulled a quick 30-40 ft in the upper RPM range. That same guy ran a 13.9 @ 101 with just a K&N filter. And if you ever look at the super street issue that talks about modding an S2K, you'll see that an intake and exhaust only add about 3HP to the wheels. BTW, my NA ran a 14.7 @ 94 so it wasn't stock. So Stage III NA or not, you WILL lose. Thats assuming the person knows when to shift in the S2K.