I was casually talking with the guy who is building my transmision and we were talking power levels and he said the biggest problem with the duramax is a junk stock turbo. He said they are too restrictive on the exhaust side and lead to high EGT's? I always thought the duramax had a solid stock turbo? he also said the VGT turbos have a lot that limits them to power output. he said often times they install there own turbos they build off of a schweitzer 300 platform and then put there own guts in them and a nasty EFI tune and he says they really rip that way. What are your guys thoughts??