There are three reasons why people usually install aftermarket exhaust: More power, less weight, and more (or different) noise. There are several pipes that claim to offer more power and less weight but without excessive noise including Hindle and Holeshot. There may be others.
I definitely would not attempt to restrict the midpipe to reduce sound levels because that could negate the high RPM performance gains of the current setup.
If you look at dyno charts for aftermarket pipes you will see the largest gains at higher RPM ranges (where we spend little time in the "real world"on the street). Although less restrictive exhaust is needed for big high RPM gains, comparable increases in midrange power can be achieved with a quiet pipe if jetting is right and the airbox is opened up for better flow on the intake side. Unless you really need a "hit" at the upper end of the RPM range, you might be better off with a quieter pipe that delivers a stronger midrange (2,500 - 5,000 RPM). I remember that Yamaha had EXUP to provide variable exhaust back pressure. It increased backpressure at low RPM to increase midrange and it worked. It opened up at higher RPMs resulting in the best of both worlds.
I have had great success with a HS stage 1 jet kit, airbox modification, and ignition advancer and a stock pipe. My midrange is very strong and my bike is "sneaky fast".
I still wear earplugs to reduce fatigue from wind noise and it really helps.
My goal is to be able to go fast as quietly as possible. This setup might not be for everybody but I love it.
If you want more sound than stock but not as much as you have, consider the HS Touring silencer or the Hindle Street silencer.
Hope this helps.
Topic: Too noisy for Old Guys? (Read 5698 times)