Kevin,
I've been using them for a couple of months. I really like the Hatori muffler but they really
need a better mounting method.
The stock S shaped spring things were a bolt in and easy installation but after three sets broke
and almost losing the muffler I installed a Dave Brown pipe mount. Very nice and clean installation
but broke on the third flight. I am now using the Central Hobbies pipe mount and so far so good.
The problem is keeping the heat from the pipe away from the mount. With the Central mount I am
using now I first wrapped the pipe with a couple of layers of teflon tape, then a couple of layers of
the silver tape A/C -Heating contractors use on heating ducts then the muffler is held on with a zip
tie strap. So far it's working OK.

tommy s