Low power? Check for boost leaks. We also pull the exhaust housing off and remove the vanes and sandblast the housing and center section apply lots of anti-seize and reinstall. Also check the plug that goes into the VGT controller on top of the turbo they become brittle due to heat exposure so be careful not to break it if it isn't already broken. If it is broken a 7.3 injector plug can be spliced in to replace the original plug and I personally like that style of connector better. Hope this helps
Has plenty of power still. I switched out turbos with a cleaned one with lots of anti seize. It doesn't do it as much now but still does it. I put new boots on it, the plastic cac didn't have any cracks.