true, gotta go whole new setup pretty much, cant just drop the muff.I understand dynce... even my chop is basically an open pipe setup. But you can create backpressure with pipe diameter changes and bends. However, I don't see that being the case with most rocket exhausts.
now this is a VERY good argument. quieter bikes do less damage to hearing than a loud pipe will. I even notice a difference on a stock bike vs aftermarket muffler, let alone straight pipes.i have a slight loss of hearing from not wearing ear plugs during my loud pipe years... a straight pipe will be more damaging.