Kevin,
you will need to swap the entire turbo, the stock wastegated exhaust housing wont fit that turbine wheel. The stock turbine wheel is an odd size and not a standart stage II or stage 1. Besides the tiny .36 A/R exhaust is what is restrictive with the little turbine wheel and tiny outlet. If you just swapped over the whole turbo, you would need to do an external waste gate. That was the turbo I was thinking about going to next, because of the even bigger compressor housing just for the noise, and has the .48 A/R exhaust, though I'm thinking the .63 is going to work fine once the M-46 is installed. FYI the stock turbine wheel also wont work (if you tried to use the new center, compressor, and stock turbine wheel and exhaust lets say) the shaft isn't long enough to accomidate the T4 compressor. The T4 is a good 1/4 or more thicker than the t3 compressor wheels.
I have tinkered with the chineese turbos quite a bit... My vote would be for a setup like I did with the internal waste gate already on it. You can get the interally wastegated t3/t4 with the .63 A/R exhaust housing just like what I'm running for around the same price. If its going in your car with the M46 I think you will be happy with it.
Jason
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