Well, the only way to find out is to race. There's too many factors to tell accurately here. But while we're bench racing, check out the times each one will do stock:
http://www.albeedigital.com/su....html1993 Toyota MR2 Turbo 6.1 14.7
SR20 S13's at stock boost will do 14s. If he has a FMIC and upped boost, he could very will dip into the 13s if he's a good driver. Good luck.
Oh and I don't know why, but i've seen some weird people use the word turbo timer in place of the word boost contoller. Usually noobs and ricers though..