I think my turbo is dying. It is a Hx35 off of an H. O. 24V with about 220K on it. I got it used from a friend and it was a great improvment over from my stock HY30. It has started to squeal at different times often when its cold, hot, warm, etc. Should I replace it temporarily with the HY30 and send the other out for rebuild or buy a new one like a PDR or City Diesel? Also what does a wastegate do? I know I have one on the HX35 but do I want one on a new turbo? Who can I send the turbo to for a rebuild? Well thats all I can think of now.