Bugeyes were only 02-03. Stock turbos had internal WGs.
I'm not familiar with the 60-trim compared to, say a 20G, so I'm not sure exactly what will be needed. However, if it's much bigger than stock, you'll want an upgraded fuel pump (walboro 255) and injectors. If it's a big turbo and you're going to be pumping a lot of fuel, you may want to look into new fuel rails. The stock rails are a serial design, so the last cylinder can go lean under certain conditions. A parallel arrangement is preferable for high fuel needs.
If that turbo is bigger than a 20G, it's going to be strangled by the stock TMIC. A FMIC is reccomended once you go with a big (and hot) snail. ANd if you go FMIC, you'll need an Intake. The stock aribox is good for up to 350-400awhp, but the FMIC piping usualy requires an intake. And as long as you're digging in there, you might want to research the TGV delete mod.
Your buddy WILL grenade his tranny eventually. The WRX tranny is just able to handle the stock power. Much more and you'll turn it into confetti, ask Thorne.