I'm just thinking about SC14 alternatives. Sure I love the SC14 because it is an OEM Toyota part and it will be easiest to get right past my smog technician (it looks nearly identical plus it's hidden down low), but because it is hidden down low, I bet I could also get away with a twin screw type more efficient blower and perhaps get 20 psi out of it instead of only 16 or 17 psi out of the SC14.
The only problem is that these rarely have magnetic clutches, but I am willing to make the JDM SC12 clutch fit it, that would be sweeeet.