So on the Heng Long Sherman, the exhaust diffuser grill on the back of the tank is solid in the front. So no air or exhaust can actually pass through the diffuser.

I believe it is supposed to pass through it



Do you agree?

Yes, it’s just a sheet metal grill of louver to direct the exhaust backwaters from the exhaust pipes.

The original design before the diffuser caused the Sherman to kick up a lot more dust saying, "Here I am"!