ORIGINAL: Schummie
Merlin man,
The muffler is the ''Slimline Inverted Pitts for Thunder Tiger 120''. I got the tip on this forum, and it fits perfectly. No drilling or sanding needed. I can also assure; perfect sound with the OS 120 AX. Turns the 16x8 at apox 9400 revs after just a few tanks.
Regards,
Eric Schumacher, Netherlands.
What kind of speed and vertical do you get with the 120AX?