I realize I am a little late on this thread (been out of town and also the
Easter holidays) but thought I would add my two cents.  I got about four
years/80,000 miles on my first S&S Header exhaust, and then installed a
second.  Although I will not say it was easy to install, I had no major
problems, and installed both headers without the need for any modifications.
  A bonus was that the second time, I only bought the header (and not the
$150+ muffler) for about $180 (correct my price if I'm wrong Ken) from Ken
at vanagain.com, and use a $15 JC Whitney universal muffler.  Good bang for
the bucks in my opinion.
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