FWIW - I have a '17 RGU w/bone stock 107. I bought a decatted head pipe ($150 on ebay) for the heat reduction. With the stock air filter, stock mufflers and no tuner, the exhaust note was the same and only marginally louder. The bike performed well with no pinging and no noticeable gain, or loss of power anywhere in the RPM range. Seat-of-the-pants? It felt like the bike wasn't working as hard and responded a little quicker... And the heat was similar to my old twin-cam 88.