I ran the ExTech .21 pre-run with 2056 pipe for the first time. Runs great, broad powerband from top to bottom. Couldn't get the temp above 180's with a P4 plug, the outside temp was around 48 degrees. It had so much power and a good idle I didn't want to lean it any more. Also, it seemed a little oily around the base of the carb which attracted dirt. Does anyone do something to seal the carb up, I've read of some using a small amount of silicone sealer at the carb base. I figured if it really needed that EB would have done it.