Thinking about switching my 3.5" Rinehart mufflers to Cobra's 4.5" Power-Flow mufflers part#6215. Going with SE fender and bags on my 09 SG so need a bigger muffler to fill the bag and fender cutouts. A friend has the 4" Cobra's and they sound pretty good. I don't care for the sound of the VH Monster Rounds...too quiet. Does anyone have or heard the 4.5" Cobra's??