Got to test the tower hobbies muffler today!!!! Must say it was money very well spent!!!! Before the fazer would struggle out of a hover, now it rockets out of one!!!! Went from hovering at 3/4-full throttle, now hover at 1/3-1/2 throttle. How good is that? Had to richen up the mixture around half a turn from the standard muffler, which shortend flight times. However the power gain was well worth it. The guys at the field were more than impressed with the outcome. Not many aussies have seen the tower muffler before!!! I would recomend anyone with a OS46fx to get one!!!