Hi Tom,
Dunstalls - Still my favorite song. I had them on all my old vertical twin bikes, the Brits and my Yamaha TX650A.
Still the best sound ever from motorcycles. JCWhitney makes about the cheapest copy. If I knew I could get a good extention on my headers to get the 27" Dunstall replicas to the rear end of my bike, I'd buy a pair tomorrow just to try them out. Absolutely the sweetest exhaust note ever. I know our younger members won't remember that, but you can play all the Scepters, D&D, EPCO, Thunderbike & Specialty songs you want. Nothing compares to that sound.
Dennis