Harley offers (for 2012 FLSTF Fatboy) the following part number for the Screamin Eagle Mufflers: #80680-12 These mufflers, I understand are much quieter, and may have Cat Converters incorporated within them. The models (for Fatboy) up to 2006 - which then was P/N# 80445-03 does not have Cat Converters and are a bit more open, and have a more pleasing sound. My Question: Does anyone know if the header pipes on the 2012 are the same diameter as the ones on the 2006? And if the muffler connections points are the same? I want to install the older version (still available - on some parts websites) - but am not sure they will fit the 2012 Fatboy? Is there anyone out there who can advise me on this matter? Thanks!