Hi Dennis
I sell the one that bolts on. here is how people use it, I send with 4-40 x 1/4 aand people buy a small worm drive stainless radiator hose clamp, you open it up and bolt both ends to either side. Or some make a steel "U" that the bend to a L at the ends and bolt on, other drill 1 hole in the center of the tongue muffler, and bolt to the R/C butterfly web in the exhaust center//I do not recommend that... although I may have an Adamisin tube setup like that
Randy Smith