I’ve heard of this before why a turbo muffler why not a normal muffler

Because the one I bought had the right size inlet and outlet, it was cheap and it said turbo on it.
But yeah, whatever fits.

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I think it was Bruce and maybe Steve mentioned an insulated roll-up door. I have not seen one, but it sounds like a great idea to consider.

I have a roll up bar front window on my poolhouse that is insulated, works pretty good too. It's simply a 1/2" foil like insulation attached to the door. Rolls right up and down.