Hey Gary, glad I could be of some help, I got all my help off the guys here. Welcome to the Drumhead Nation!!!
Hey BBQWildcat, I doubt you need the 90* elbow. I have to vent my exhaust out of my little Q shack so I don't want a elbow and I don't know why you would need one. You are correct about the extra weight IMHO. Also with the short 4" pipe I can shut down the drum with just a tin can over the pipe. I guess guys with 8 holes somehow plug them all up.
Drumhead - UDS x 2 & UDG
Keep on Smokin'
KC native missin' KC
IMBAS Certified MOINK Baller 2009
I also support PETA - People Eating Tasty Animals