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I kind of have an answer for you. I went from a low geared 904 to a 727 and it lost a tenth in the 60 and two or three in the 1/4. This was with the same converter as I just had it switched to a 727 setup. It lost that much ET on the motor and on the nitrous. Bigger nitrous pills got the ET back but the 60 never came back.



part of it is all that extra weight slinging around in there on the 727