It will have a pipe with option of the header muffler.
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Set the pipe on the first few flights and you'll toss the tuned muffler, and never look back.
If the airplane can package a tuned pipe there is absolutely no reason to even consider a muffler. The pipe is better and easier to deal with. Set the length and you'll never have to change anything except maybe a quarter turn on the needle occassionally.
Use one of Randy's pipes...they're foolproof!
The only reason to even conside a Header muffler is if it's a classic legal airplane or the fuselage simply won't pakage a pipe.
The PA's are the perfect pipe engines.
Randy Cuberly
PS: Nice crutch...very much the way I build mine...I mount the engine on the bearers then add the center pieces to take any stress out of the mounting lugs/engine bearers. Looks like that's what you've done.