I did another dyno test on a Superflow dyno. We did 5th gear and 6th gear, and the differences were negligible. They were within 2 whp and 2lb/ft of each other. I used Performance Factory, up in Concord. They also read the boost at 16psiSorry, but I'll take the word of mainline. Different gears do give different torque readings unless the dyno is setup to correct them. There is a shop in my area that is known to make insane numbers of torque because he does 2nd gear pulls to inflate the numbers. You could also simply change the tire size on the dyno configuration and see how it can affects torque.
Even if we disregard how dynos measure torque, the car's ECU could simply output different torque numbers at different gears. Only way to know for sure is get a car on a dyno and test it in different gears.