Im shopping for a 2 into 1 exhaust... and I noticed Harley has a muffler called the night stick pn 80881-10 for the 2010 model bikes that will fit on the 2010 bikes stock head pipe...It looks like a super trapp????...plus it's epa legal and all that ....What IM wondering is if a guy got a 2009 or 2010 model head pipe set and the nightstick muff will it fit on a 2007 RK....any body out there know if this is even near possible....maybe????