Yes starting with serial number 0W650000 THRU 1A299999 and up on the 5.0 MPI's, the mufflers became known as filters and are located in a different area under the IAC motor assembly. Item # 12, http://www.mercruiserparts.com/Show...12840&bnbr=82&bdesc=Throttle+Body(Mechanical)My engine has the filter outside the throttle body, between the iac and the flame arrestor. I think the model changed. It is more like a rectangle, note a cube.