I had a kerker supermeg on for a long time. Found this one on Craigslist and now both my softail and Dyna have thunderheaders.

 

I have a thunderheader on my Twinkie Fatboy. it's been there for 10+ years. That bike had several pipes before that one. I have no desire to ever replace it. If something happened (and I didn't junk the bike), I'd replace it with another thunderheader. I wish I'd gotten one for my fxr as well, but I went with a fancy 2-1 instead. There's nothing like the sound of a thunderheader, though.