2 alu angles on 1/2" silentblocks (two per side) , one angle bolted to the engine ,the other towards the build-in stringers.
Fill the gap between the cradle and the stringers with block of wood.
I always cut pipe-stingers to 35mm/1,38" when using a muffler.
Without cutting shorter your back-pressure will rise.
And if possible I ream the pipe-stinger 0,5mm/0.02" wider.
Mike's carbon is 1,607"/40,84mm in diameter.
I use his tubing for European -82dB mufflers.
All Mike's mufflers are custom-build ,
you just have to ask. > t-modracin [at] comcast [dot] net or mtyson [at] budweiser [dot] com