well after reading all about the pro 46 i bought her an installed her on a np ultimate 40 i didn't want a large muffler hanging out the side an after reading a reveiw in fly rc on a world ultimate i bought a slimline muffler problem was the tube were so long that i had to cut them down then when starting the engine she had no back pressure an i never could get her to richen up an she got really hot i then hoping to get some back pressure installed some wheel collars inside the tubes she now richens up an seems to idle well but don't know how much power she has lost
is there any one who makes a nice inverted muffler that will come out the bottom of my cowl an still give me lots of power, what kinda r's should i get on a 11 5 apc prop