Wow, that is a beautiful plane!
You know, Kieth said that he does not reccomend the JA Pitts Muffler because it takes about 20% of the motors power... I am using the stock muffler. Have you gotten a DB reading yet? Mine comes out to a startling 103db.... I need to get it down to 98 at LEAST but I don't want to loose more power, My Extra came out to 16.2 lbs, I wish I could find a way to lighten it. I built it all stock.
As you can see by the picture, I screwed up the flare blocks and didn't really notice it untill I glued the tail in.

I'd put the canopy on better, but I am looking for a decent pilot figure before I perfect it.