Lukey_04

Hi all!I’m new to the forum. I’ve got an offset smoker, cosmogrill XXL, similar to the Oklahoma Joe highland and I’m looking to upgrade the 3” stack to a 4” one for better draw. The diameter of the hole from the cooking chamber is 3”, could I simply attach a 4” stack over the 3” hole which would make the draw better? Or will adding an extension to the stack create an adequate draw?Thanks in advance