After reading some posts on drilling 8 1/2in holes in the stock pipes, I've read that some also drill out the baffles. I am new to cruisers (10yrs of riding GoldWings). I have an 08 C109R. Question is, whats the process for drilling out the baffles? I have already drilled the holes around the center hole and like the growl, now I want the deeper muscle cruiser sound.