It's about the same weight as the stock stuff... Either way, the stock stuff won't last long so you will end up with the Dubro stuff anyway!

Until you can get the Tower muffler, you ought to take the baffle out of the stock muffler if you want some more power. Just take it apart and take the little metal thingie inside out.

To enlarge the rudder and elevator just make each piece 1/2 inch longer.

You can either just glue a 1/2 inch piece of 1/4 inch balsa onto the leading edge of each one or make the sticks bigger... Just making it a bigger stick built surface will be lighter, but it's not a big difference.

Someone else should be able to explain it better. If i get some time tonight I'll draw a picture in paint and post it here...