my 700 had a burned out 2 brothers slip on on it when I bought it, not too sure about the head pipe. was the most sick obtrusive sounding thing I ever heard, was ashamed to ride it down the street! I repacked the muffler, still too loud. made 3 open baffles for it, (out of alum.), it melted the alum. and sprayed it all over the spark arrester screen. after I got it cleaned up, I built a spiral 3 ring baffle out of stainless steel. spiral baffels do not cut flow very much, I have used them on my last two hotrods, they work great, w/o much obstruction at all, and sound and work better than a flowmaster. anyway, the baffels swirl the exhaust into the packing, while the center tube is straight thru, two of the spirals aren`t full size, I did tack weld them to the inner perforated core. the thing is as queit as a stocker now, almost too quiet! sould be about right when the packing burns out again! amazing difference!