I have a 261 in a panel truck that I switched back to a factory manifold to eliminate the drone resonating from the back of the truck .
The present muffler is just ahead of the rear axle on the drivers side and although the it is much quieter now there is still a drone when operating the motor in its happy zone. Its fairly quiet until it gets to the 2,500 to 3,000 rpm range , which is where it usually operates then the drone gets louder .
My question is , would moving the muffler back behind the rear axle make a difference in either interior sound or performance ?? Its a one ton truck with lots of room for a muffler out back if need be .
John
