I have been stopped twice now by CHP and both times I was told I was "heard winding it out" (no citations though). I have an unk. type carbon slip-on that is too loud (yes, there is such a thing:twofinger ) Who makes a s/o that is relatively quiet? It does not have to be factory stock quiet, but reasonable. I had the M4 in mind anyway, but not if it is gonna be really loud. Any suggestions?