High exhaust back pressure

[Rawze]

pull the cans, take pics of the faces and post em here,... take em to a stealers$it and have em baked, de-ashed, and flow tested.

check the decomp tube while you are at it...
http://rawze.com/forums/showthread.php?t...07#pid1807

use a boroscope and check the face of the SCR element to see if it is face-plugged too.

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while it is apart, pressurize the whole engine up to about 30 psi and check for leaks via block plates on intake and exhaust of turbo + air supplied in where the turbo inlet temp sensor goes. fix any leaks found.

after that, do a turbo inspection if u suspect ur new turbo.
https://youtu.be/ZUpKb5umv_0

Also verify you put the right turbo part# on your engine. Seen where stealers$it or other shops use wrong model turbo on engine assuming they are all same because they look same. They look same on outside but there are different turbo's w different turbines for different tier engines and it can greatly effect regen problems. Register an account on quickserv.cummins.com with your esn number and look up the right part#. Compare it to part# on turbo and invoice.