anything with a T3 turbine will fit, you'd have to get some bigger hybrid combo or something, then again some other kinda turbo might bolt up to it never know. Now the turbo that comes with the star kit is already freakishly big so if you want more than that you better be plannin some major HP cuz the T3/T4 is pretty tough to max out. Also you might wanna take turbo clearance into account cuz it may hit the radiator or something if its too big.