As in? The turbo on the 12v is fine but the one off my cr is bigger and has a 4" down pipe, and I figure I would help lower my egts(on going problem during everyday driving) plus I'm sure the 40's don't help.
The manifold hole shape is different which allows a 2nd gen manifold to be swapped onto a 3rd gen cummins with no mods, but some modifications are required when swapping to the 3rd gen manifold on a 2nd gen cummins. Square vs. round holes I believe.
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