Nothin and I mean nuthin has a sound like a couple of these in-liners hump'n down the road. I'd rather hear 2 sohc's than a hunnert V's!!! This summer has been the best one i can rmember inna a long time just becuase of the friends I've made share'n roadspace and shop time with. Comfort zone? Anywhere 2 or more HCMFR's meet!!!