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75 Posts
im installing a firebrand grand prix muffler on my 500 and have called 4 dealers so far about getting it reflashed so far ive got 2 no's 1 yes and 1 maybe the popular opinion seems to be that if youre changing just the muffler then no you dont need a flash but if you go to a high flow air filter or change the intake then yes it will run leaner and you will need it re programmed . ..myself, im going to check the spark plugs before and after a couple miles of running with new muffler to see if its too lean