i got a 99 civic si with a t3/t4 turbonetics turbo(drag gen III kit) and im buildin my motor right now and thinkin about upgrading my turbo. right now im puttin out 222whp at 8psi
i want anywhere from 375+ whp

heres the turbos i was looking into
SC34
GT32
GT28rs

my question is...what would be the differnent whp #'s for each turbo at about 18 psi?

 

couldnt u use the hybid to boost more? i thought it can withstand upto 15psi?

 

sc61

I dont think the gt28rs will get you anywhere close to that and be efficient....