Do NOT use Slate Performance Automotive. They screwed up my turbo install in more ways than you can imagine. I uninstalled/reinstalled it myself 3x to fix it.
Gator Motorsport on the Carmel/Indianapolis border has done a bunch of work on my buddy's Gen 1 NSX and he's been very satisfied. Either them or Graham Rahal Performance are who I'll go to next time I need professional help.