So I got a MAC Performance muffler because I wanted something louder then the dyna. The install on a dyna is almost exact, the real difference is that you use a tin can instead of the OEM gasket.

When ordering your Mac I recommend you also order

muffler/header connector
P/N 14771-46E00



Header and Cylinder seal
P/N 14181-45C00



If your going to be D.I.Y. then you should be able to take the old muffler off easily, All you need to do is loosen the 2 header bolts, separate the muffler from the header pipe and remove the muffler from the hold down bracket.

Assembly

Put the gasket between the header and cylinder and lightly snug up bolts.(we still want flex in the header for now)



With a hacksaw cut 3 more slits into the MAC muffler (this will allow better clamping between the muffler and header)
Put the Header/Muffler gasket into the muffler



Put the clamp on and put the 2 mounting bolts thru the rail, slip the muffler onto the header and put the bolts thru the holes on the bike frame




Next step will be tightening everything up.
I tightened the 2 head bolts first, then the 2 bolts to the mounting bracket, and lastly the muffler/header clamp





Go ahead and start the bike, I already replaced my jets with a 52.5 Pilot and a 152.5 Main. Check for leaks (I like to use a lighter by the connections and pay attention to the flame to see if there's leaks)
Lastly Tune the carburetor gas/air mix screw.

Enjoy the new exhaust, the MAC is loud but sounds good.