has anyone here ever used, or know anyone that's used any rebuilt turbo's or turbo manifolds from www.turbocalculator.com. Their prices are good, and I'm thinkin' about buying from them, looking for some comments on their quality, specifically the manifold strength/flow and the rebuild quality of the turbo's

http://www.turbocalculator.com/sale-garrett.php
http://www.turbocalculator.com/honda-headers.php

any help is appreciated.