with a CAI and and a 15% pulley (installed by your's truly) on my '02 I dropped my 1/4 mi times by about a second, unfortunately I didn't dyno before the mods but afterwards I made 166 at the wheels, so with 15-20% drivetrain loss, that's about 190-200hp at the crank, as for torque, since I usually drive solo and I'm kind of sloppy around town, I can start in second gear without much fuss, which was obviously harder with the stock pulley. the best $150 you can spend on the performance of your mini.
Now I'm not to sure what the stock boost is for an
MCS, but afterwards I've peaked at about 16psi.
a pulley will scare your mom and make your right foot happy.