In 2003 or so ion performance used to do this for the td04. At the time it was probably 800 bucks for a larger wheel and some porting. Half to a third of the price for a PE18xx turbos of the era for the wrx.
It really wasn't worth more than some increased spool and maybe 25hp more than a td04. I used to own one.
Think about it, you now have the potential to squeeze more air, but you still have a small housing to push it through. The housing is your restriction!
@$500+, you are better off saving for a more well put together solution.