S2K's are expensive, and as I work at Honda R&D i would probably have to leave the F20 in there... as much as I love to see a tach swing to 9 grand, i miss torque. Big fat globs of glorious torque. It is pretty unlikely that a 2 liter 4 banger that spins to 9000 rpm will ever make any kind torque..
I think I could live with a miata if it had an LS2, and 6 speed, and a blower or turbo,,, or more gas than a dentist's office.....and a big lumpy cam that idles like crap... It would need to have enough power to make it completely undrivable.. except in a straight line....