Austarion

Why are the US ones the wrong fitment? I have been looking into getting a hybrid from the States. Does this mean that the US turbo flange is different to our 4g63's here in aus?

I currently have a hi-flowed TC06 and looking at buying a modified TD05 from the States. Would like to know about the differences between a TC06 & TD05 and their horsepower potential. Which one flows the most? Which has the larger exhaust housing and compressor housing. My TC06 cant bypass enoug...