I know MIke personaly, and have seen is work personally. Its great top notch stuff. He will tell you like any one else that makes manifolds, it will eventually crack, but with the type of materail Mike uses, and his welding skills, you can look forward to many years reliable service out of his parts...mostly likely your turbo will be rebuilt a hand full of times before manifold intergrity even be becomes an issue.
Green Monstah owns some of his Mike's work, and is very happy.
To any shops in the area, Mike will be in town in the next few days going around looking for work. Please DO NOT low-ball on pay, his work and knowledge is well forth a little extra money each week.
Mike also has experiences with tuning cars, SAFC's, Megasquirt's, Autotronics, Tec's,...probably some more too that I don't know about.