Yeah, it is big. The stock pipe is fat at about 5” dia., but too short to develop good draft. I sent a message to the people at Old Country suggesting they come up with a kit to add a foot or more to the stock exhaust pipe. The recognize that it was a shortcoming, but have thus far not come up with a solution. In the meantime, I am running my rice-boy fart can pipe effectively.The pipe on that smoker is huge - like the exhaust pipes that knucklehead kids put on diesel pickups now.