It's pretty easy to figure out on the forums who knows there stuff and is willing to help. Thanks for sharing the appropriate info. Turbos aren't that expensive and are easy to change.Before this gets any uglier.........not all 6NZs are created equal. All 435 to 550 Hp engines have the same internals. Not all 435 to550 Hp 6NZs use the same turbo. Some of the earlier engines at the lower Hp ratings have a different turbo. Somewhere after 6NZ33### all 435 to 550 have the same turbo........if I'm remembering correctly.
Now all 6NZs rated lower than 435 Hp are unicorns and have higher compression ratios steel top pistons. They have smaller turbos. They have smaller injectors and a different camshaft. These low Hp 6NZs are not worth the time and effort to turn up above the 375 Hp rating unless they've been rebuilt with the higher Hp rated parts.