I have a 2013 Ultra with 11K miles and purchased true duals, air breather, and tuner to install this weekend. When I removed the stock exhaust I noticed the the pipe from the front cylinder is really discolored blue from heat down to the converter. The rear cylinder pipe is not at all. I installed new hardware mentioned above and it sounds great but i noticed after running for several minutes the exhaust from the rear pipe felt cool but the exhaust from the front felt noticeably hotter. The bike has run fine since I owned it last 4K miles and took it on a 2K mile trip last summer with no problems but something seems wrong from what i understand. My friends Classic pipes with 30K miles has no discoloration. ??????