Tim said:4 into 2 is a classic period-correct modification. Jardine mufflers Put the original pipes in a warm dry place and keep them.
Tim, I like the 4-2 exhausts too. I'll look up the Jardines'. So many inline 4 bikes have the 4-1. Something different would look great. I'm off/on with the decision on the pipes. Nice originals are selling for good coin and would let me buy more shiny stuff. We'll see.