[Shamu406]

Hey guys, I've been getting my coach ready for our 3rd. annual 1 month summer trip. Did a lot of work myself including an oil and filter change, fuel filters, air filter, merge switch, coolant check, per the maintenance list from Newell. Still working on a few other things too.
We plan to leave this weekend... However,
I ran across a problem, my muffler has a dent and a small hole in it (the size of a quarter or so) from me scraping it previously, and the rear strap is bent but fixable.  All doable but upon further inspection, the top inlet neck has a straight line crack in it approximately 1/3 or so around it. I believe I could remove it and weld it, and at the same time straighten the strap, and possibly weld up the quarter hole. Especially considering the huge cost of replacement I have read in this post. Again my coach is a 1996, with the exhaust that exits out the left side on a 90* angle. Which is good because I get no exhaust on the tow! Any thoughts?
Also, my head lights are still blinking on and off. I have replaced everything, the solenoids on the fuse panel, the head light toggle switch, and the head light switch on the column too. I'm told it could be the head light ground, but not sure where to look for that at. Or how hard it is to get to. Thanks!