RE: 'TO USE' or 'NOT TO USE' a Support Strap/Bracket on a Wrap Around Pitts Muffler?
The support of the image is recipe for disaster. The engine moves relative to the fuselage, This causes strain on the muffler through the strap.
The proper way is to fit the strap to the other side of the muffler end, and stay it to the engine block mounting lug, so the complete unit is as rigid as possible before it is bolted to the firewall/standoffs.