i finally have enough miles on the bike to go above 4k rpm. the bike is very nimble filtering in the sf bay area traffic. it's also the quietest bike i've ridden in 200k+ miles. what is going to make me smile loud exhaust. i'd like a life changing experience for the prius drivers. i hate to spend the money but lights and noise seem to be working for me. i typically don't use the db killers except once a few years back because i felt so bad for my neighbors every morning at 4:30.