I have a 1979 R100RT and I have removed the exhaust, originally just to clean it up, but I noticed quite a bit of rust on the mufflers and the exhaust headers have had the rear cross pipe ports welded shut. I think this was done to accomodate installation of the Reynolds Ride-Off Center Stand, but not sure. I'm wondering how this affects performance? I noticed the mufflers also weigh a lot. Any replacement recommendations? I posted lots of pictures on my blog. Thanks!