The restriction is on the ex side. A billet wheel wont do anything to help that. Ive seen 66mm compressors in stock covers with GTQ ex wheels on the ex side.
this going on a 2.3 turbo, it might be overkill with a q wheel. he is trying to stay economical with a slight gain. I bet a ta49 would be smokin on this setup! You need to find out how to get a four bolt housing to make it work. 2.3 on e85 with a ta49 should be stealthy and plenty powerful.