I will save myself a lot of money because I am 100% satisfied with the stock exhaust. See more money for tires

Yup I agree, every time I ride I enjoy the peace and quiet especially in the am or just cruising along. On the highway I have gotten to enjoy the electric bike sound, its more like a buzz than a normal exhaust sound at 77. I think of the Formula 1 cars that do not have a exhaust note that sounds like a normal note also.
I also agree with any aftermarket exhaust that I have heard they are the same sound just a bit louder. The engineering of the bike requires the torque tubes to keep the power and mileage that it has now. I am happy with the bike pretty much as is.