I finally got around to installing new tailpipes and mufflers on my '82. These Summit mufflers have a delta shaped baffle inside and not much else. Sounds good at idle and not awfully loud when revved. The JC Whitney turbo mufflers from the late eighties are still intact, one of the tailpipes had a rust out. Liked the fit of the old pipes better, but the bends were a lot sharper.
If it ever stops raining I might venture out to the highway and see how it does.