I came across this SC in doing research. It has a HUGE step up ratio, meaning that you can max out the SC impeller RPM with a large 3.5" drive pulley. For anyone going for biggish HP on a SC Subaru, I believe this may be your best bet to do so without having to deal with belt slip, which becomes a nagging issue with those tiny SC drive pulleys. My guesstimate is that a CS-1 with 3.5" pulley and properly setup SOHC 253 will deliver about 345-375 whp.
In contrast... if I were to run my Vortech V3 Si to 52000 rpm, I'd need a 2.3" drive pulley which is relatively small. Belt slip is a pain to deal with and the bigger the drive pulley the better .
The CS-1 is also physically much smaller.
Has anyone gotten a supercharged EJ up to 350+whp yet?