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Message: [QUOTE="UPINSMOKE, post: 148185, member: 75"] It simply doesn't work that way... We have a different injection system than a duramax who can more closely control fuel delivery, a duramax turbo is vgt, and we have larger displacement motors... There are many reasons we can't get the same power put of turbos that cummins, duramaxes, or even our 6.4 friends can... I have a friend with a cummins that dynod 905 with just a 66... Does that mean a 7.3 can do the same? Dream on. We are handicapped more than you think. Steve is right. I wouldnt go any smaller than a gt47 if you are using a 38r as a high pressure turbo. You will be pushing both turbos extremely hard to make the same power you would with a 38/47 combo... That is what Charles started with, but then moved to the gt55. Lots of guys run 42r's without issue as singles. [/QUOTE]

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