Here are the specs on a toyota CT15B....
im posting this at its relatively unheard of
Impeller d1/d2 46/52mm
turbine and wheel d1t/d2t 60/48mm
6000r/min 1st gear 0.60-0.69kgf/cm2
no problem....i should have the specs on the upgrade for this turbo. there are 2 of them one produces 600hp. however it costs about 2500usd to get. im sure they can be sent off for upgrade and pay less.