So I was undecided on an exhaust. After doing my research I decided to go with Austin Racing GP1R. Austin Racing has several different mufflers as well as options including the MotoGP Race muffler (I started to get that one). When I Google the pics I did not see the muffler I wanted on a 2016<. But the images on the 4th Gen gave me a good idea. I added pics as well as my You Tube video with sound tests. I highly recommend Austin Racing but be warned they do not mass produce their exhaust systems, they are hand made to order and takes 2-4 weeks. Austin Racing uses Inconel which is superior to Titanium and Stainless Steel.