Any Exhaust mufflers available for the xs650, without needing rejetting?

[B Burdine97]

Hey guys, was looking at getting some new exhaust for my bike (1981 xs650). The stock baffles in the stock muffles have rusted out, causing the bike to sound like crab, especially when down shifting. I was just curious if anyone knows if there are any exhaust mufflers that have the same amount of back pressure as the stock ones do. I would like something I can bolt on the bike, and not have to rejet the carbs.Is this possible at all, or is there a possibility Ill have to rejet the carbs with any muffler I get.
Thanks alot

 

[Growl]

You might try using older stock harley mufflers... say 1990s era before they went to catalytic converter mufflers... mufflers off a sportster or dyna model.