Baffle replacement is not easy, sometimes they will not come out without damaging the housing. They were not really made to be removable. You will need to see if you can get the baffle loose first. Otherwise you would need to order a replacement muffler with the baffle installed allready. Also if you do install the quiet version. That baffle will not come back out after it has been ran as the tape and wrapping seal themselves into the housing.
MFR PART No: 504-FBLQ
ROLLIES PART No: DD504-FBLQ