greddy turbo for ls

has anyone installed the new greddy turbo for the ls?... how come the kit only goes for the 96-99 ls... why doesnt it include the 94, 95, and 00 models?... and is the kit CA smog legal?... if u look at the hp gained from the turbo, it's pretty weak if u ask me... they only got 164 to the wheels... so what's the deal w/ this new turbo?... tons of questions.... thanks in advance