Dave,

Here is a link to more information about the muffler/mount combination:
http://www.aero-sports.com/airhobbies/mount.html

I have yet to run it with this setup but from what i have heard they work quite well. I think the volume instide is quite a bit larger than your standard muffler and air hobbies sell an internal aluminum baffle for $15 if you want to make it even quieter. I may try this as well to see the effect it has. The nipple you see in the picture on the muffler is for an optional smoke system if you want. I have this closed completly off for the spitfire.

I was hoping to route the exhaust out the scale location but this may be a bit of trouble so i may have it going out the bottom. verdict is still out on that. I'll let you know how i make out.

Hope this is helpful. Let me know if you'd like more pics, I have a digital camera and would be happy to snap more. Cheers, Sean

PS. Were you able to put anything together in regards to the dry transfers we discussed? I'm still interested in getting some!