Awe yes Waldy Petrowski(not sure on spelling). Met him on our way up Frisby on our 85 plus's!!He was concerned his sled may be to noisey so wanted us to go first. Lol. His pipes exit right out right side belly pan side. Quite a few years ago.
Found some old pics from June of 1995. Waldy and his buddy( was the butcher in Revy). What a weekend. Waldys Mach was loud but this climber he built was insane. Probably the only 600 to climb the 90.