If you go with the Tam's pipe, there's no tendancy to climb with throttle. Mine's completely neutral throughout the throttle range. The tam's pipe is straight out, the Skymaster one has a bend in it, maybe that's why there's a diff.

Takes a little work to fit the Tam's, it won't go in with the engine mounts in place and you need to open up the back end a lot more for it.

I agree with the guys on the CG. I'm back at 325mm and it flys really nice. I originally flew it at 300mm, then Ali flew it and said to pull the 1.5lbs of lead out of the nose! He loved it after that and I've been flying it like that since. I never would have had the nerve to do that on my own!

Mike