was just wondering if it was worth it and what the benifits of doing this would be?

 

I think the 20g comp wheel only fits a td06

 

You can put pretty much any compressor wheel and housing you want. The turbo size I.E. TD06, TD05 is what is important. TD06-20g will yield higher top, while giving up a bit of spool to a TD06-18g. I don't think a TD05-20g would be a wise choice. I just sounds laggy. It also depends on displacement.