About 250 miles on it. I was told you can knock the inside out with a stick, kinda like guting a cat. So, I pulled it off and tried to knock it out. Right away I realized there was no way it would come out. There is no damage to the the pipes at all. I just wanted max flow and a meaner growl, wishing I would have just got the non-resonated to begin with.
As far as price I was thinking $650. It's practically new.