When I had my 91 mach 1 617 I had a hell of a time finding any after market stuff! I had crankshop twins on it and they were loud when I owned it i did not ride it but i rode it when the original owner had it and they were loud and the sled was pretty fast to for its age i sold that sled for $100 bucks it needed some work... I bought it for $300...
~1995 Polaris XCR 600 with 2000 Polaris Triumph 600 engine inside~
~I'm a Boondocking, Ditch-Banging, Drift Bustin, Powder Carving, Trail Riding fool~