So my dad has co-worker who's husband works at a HD shop. So I have probable access to take-off Dyna mufflers.

My dad emailed him and he wanted to know what years to look out for. The problem is, I have no idea. Are they all created equal? I haven't read anything on here or other sites that say a specific model year for the muffler, so I would like to assume, but you know what they say about assuming.

So, any year qualifications before I get a pipe, or are they all good to go?