Can't remember if I told anyone - if you do the ST2300, you MUST reduce the length of the mounting lugs ON THE MOTOR!!!! to make the stock mount work. I have pics in this thread someplace, and explanation/pics on my website.

In addition, you must take just about 1 mm off of EACH of the hardwood beams to permit everything to line up.
I really do NOT recommend a piped setup with this motor, guys. It will simply be too, TOO much. Just get a canister muffler, or make your own (instructions on my webpage) and muffle it. That also permits you to just modify the tunnel, and not hack into the fuselage to modify it.

One other point - new Excelleron guys - gently remove and THROW AWAY the steel hinges supplied. Particularly if you're doing the ST 2300. Buy Sig "EZ" Hinges (as they are thick enough to use the slots already in the bird), and they are very reliable. Do the "draw a line with a pencil on both sides of each hinge across the hinge center at it's flex point" thing.

Finally - Don't even bother with a 7" CG. It is FAR too nose heavy.