RE: 3208N exhaust leak
That was typical of the fiberglass exhaust tubes on the Californians. *They used mat Fiberglass to form the tubes. While the inside, which was over the pipe form, was nice and smooth, the outside was left rough and was difficult to get a seal with the exhaust boot. *
Take the pipe off and lightly grind the uneven high point areas down. *Don't go to far into the tube though. *Once it is fairly even, paint the area you ground down with fiberglass resin mixed with hardener and a topping agent (so you can sand it.) *Sand it smooth, if there are voids mix some chopped fiberglass with resin and fill them in and re-sand. *Repeat this step until you get it right. *
Mine tapered down at the end, which didn't help sealing to the boot which didn't taper, so I built them up a little and smoothed them out and it solved the problem.