I don't know if just me but my 2012 Ram 1500 Crew Cab 4X4 Big horn with the Hemi seems to be getting louder it has 8300 Miles on it the Exhaust seems to be louder now than when I first drove off the dealership.
I started up this morning it was 32 degrees outside I don't know if this has anything to do with it but years ago when I had My 1997 F-350 with the 7.3 power stroke it seemed to be louder on cold days also.
I thought the Big Horn had a different exhaust to the Sport models. I test drove both at the dealership and the Sport seemed far more louder. The paperwork said Aggressive Rumble exhaust on the Sport but nothing on the spec. sheet for the Big Horn.