Well i finally got the chance to install the smoke system. I am def. adding some weight here but the 91 should still yank it around ok. I will just have to be careful on takeoff and landing. I do believe everything is done i will just have to check my balance again and make sure, but i have the options of moving the battery packs around. I am using a seperate battery pack for the smoke pump and have plugged it into the radio on a y-harness with my retracts. I still have to run one more tank through of break-in so i will leave the retracts unplugged and test the smoke system at the same time. I don't think you would want to have a bigger tank than 6 oz. as room becomes an issue. You could stuff either the smoke pump or the tank up under the fuel tank but it is not easily accessable so i chose not to. Anyways here are a couple of pics of the install, i plan on tucking the reciever in just behind the pump.

Flyboy76