20 PSI?
99.9% of people with superchargers do not run 20 PSI! BTW, KB ran the 1.7L to 24 PSI, but the engine blew-up. BTW, PSI is not the only consideration, volume counts as well.
The KB is good for constant 15 PSI, has instant torque, and pulls hard to redline. It is the best of both worlds.