The last two TT Pro 40 I have purchased have experienced similar muffler failures. The 5 inch long threaded 4-40 type fastener keeping the muffler together has sheared internally. The first engine on engine fight 40 the second engine during tank number 3 during break-in??? My solution has been to drill and tap the aft end "bullet" to the forward muffler body. No muffler flow characteristics have been changed, the baffle remains in place as purchased. Does anybody else have this problem or am I just a moron.
MaxQ