I have these on my '65 FB.
They also sound correct on these cars. Flowmasters sound awful. I'm sure the bonehead who works at Taco Bell or Autozone thinks Flowmasters sound "hella sick" on his clapped out '84 5.0. Don't be that guy.Tilt head to raise your nose in the air when anyone mentions their Flowmasters, Magnaflows, etc. This projects an air of superiority that they likely do not understand. Then remember the phrase, "Glasspacks don't drone."
No, respectfully, I think these are more like a turbo with sound dampening material packed inside. I know they're shaped like a turbo muffler. Not sure how they can be straight through when they're offset inlet and outlet.Magnaflows basically ARE a more mannered glasspack. =) Just a nice perforated straight-through tube surrounded by sound-damping media.