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Back in the olden days when I worked in a shop that sold Hondas, Kawasakis, Husqvarnas, and Pentons, every exhaust had a stamped imprint of approval in the metal. No stickers, period. The only exceptions were exhausts intended for closed, contained course racing. Tracks such as drag strips, mud bogs, dirt tracks, indoor motocross, pulling tracks, and road racing venues with no plants other than mowed and raked grass within a certain distance of the track, distance dependent on speed, could run anything. Street bikes that did not have mufflers approved for off road use so were not allowed off road legally. US and state forest service personnel wrote some tickets with hefty fines if an exhaust was not properly stamped.
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