Hi guys, 1973 TX650, stock exhaust system, stock carbs, stock air filters and air boxes. I have searched the forum and read most of the threads on rejetting after putting on a new exhaust. I want to replace my stock '73 exhaust baffles with something different. I plan on keeping the stock airboxes, filters and headers, just changing the baffles. The stock baffles are very muffled, and about 25 inches long. If i replaced them with different muffled exhausts, will I have to rejet? Does the length of the mufflers have any impact on whether you have to rejet? I ride this bike every day to work and cannot be bothered pulling my carbs at the moment. Also, what diameter exhaust do these bikes need? Read in a thread 1 3/4, is that right?