Yesterday I put in a Cat Delete on my 2013 STL. Mostly to reduce the heat in the confined engine compartment. Went pretty smoothly. Glad I read jwulf74's post on tips. At first I though I had bit off more than I can chew but, got it done. Also changed the oil and filters while I was in there. The bike has a more throaty sound but not really much difference. Got the Cat Delete from RLS Exhaust with a Ceramic coating. Used code Exhaust50 at check out and saved $50.