I know what Jim does, but the "small turbo" is the "small turbo" because it has a small compressor wheel, putting a bigger compressor wheel would mean it is not the small turbo anymore. Are you are Caltracs for traction or to stop axle tramp? if for traction you need more than just the springs, if for tramp, there are cheaper options which would be more streetable. p.s. I still think his mums clutch is not operating correctly