Is there going to be a ground clearance issue with the "borlamouth?" The XR-1 muffler, that is.

 

If your riding at stock height, you should be fine. The Borla XR-1 is 5" in diameter if I'm correct. The bullet that was in my Rumbler was 4" in diameter.

So clearance wise, you're only losing half an inch.

It also depends on who does the install.. But you will be fine with the Borla.