Your first uncorked trip, to the muffler shop...

I never made an "uncorked" trip to the muffler shop.
I have driven my cars to the muffler shop after installing headers, though. However, out of respect for my neighbors, and people in general, I've always bolted up a cheap, or used set of header mufflers for the drive the the shop to have a new exhaust system installed.

I purchased a set of Hush Thrush turbo mufflers about 35 years ago, and I still have them. each time I've installed new headers on one of my cars or trucks, I simply bolted them on for the ride. Once there, the shop tech would remove them, and when I picked the car up, they were always in the trunk, by request, for use the next time around.