Originally Posted by D-Unit121 if you have the verson with the T04B compressor housing (GT2871r (4) on http://www.turbobygarrett.com) , then the gtx compressor wheel should be a dirrect replacment for your current wheel.
"This is a drop in replacement 11 blade billet for a GT2871R or GT3071R with a 52 trim compressor wheel. The addition of this wheel will increase spool time and flow capability. The turbo needs to be VSR or Cartridge balanced once the wheel is installed. "
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You can get a billet wheel from snail turbo that will fit your current housing. You still will need to have the turbo balanced. the cost to upgrade over the increase in performance is not worth it.
The GTX wheel's advantage is not that it is billet, it's the aerodynamic design, which could be cast and would have the same benefit. In case there was some confusion.
I forgot to mention snail turbo makes a exact copy of the garrett billet and their own design. all the data I have seen the snail turbo design is better than garretts.