MTI is http://www.motorsporttech.com/ and there located in Houston. They offer packages for the LS1/LS6 and they also do a 7.0 Liter 422 CI motor. Do a search for SW on Corvetteforum and you can see his 99 FRC with a 422 run 9.9x
Since I have changed to MTI I have received 28 E-mails "EVERY" one of them from a happy customer or someone who knows a happy customer. I could have saved myself a lot of problems and had my car back by now had I gone with them in the first place!
If they are good enough fo SW and all of his customers they are good enough for me.