New to XRs. I Mostly commute I like the quietness of the stock muffler. Can I change the jetting or do some other mod to improve the performance and keep the stock quiet muffler or do I have to buy an aftermarket muffler. If so what is the quietest muffler. I'd love more of a deep rumble but I live in a crowded neighborhood. Also, I love looking down on ALL the bikes I come across, and going eyeball to eyeball with tall pick ups.