[Beerwolf]

What is the Dia of those exhaust Tubes? Did you square the radius and multiply by Pi (3.14)? Assuming 3" pipe, both stacks would be a little over 7" and one stack 3 1/2" so you are definately in the ball park of horse shoes and hand grenades, which seems to be about as close as it takes to work

My Weber lid has 4-1 inch holes or roughly 3.14 square inches


You are also onto something with the basket size, I learned the hard way on the 2 units I built this year, My drum basket wound up about 16" dia x 5" deep and it runs rock solid.

Your smoker is the first Ive seen using a gate valve on the inlet, let me know how it works for you.