I have a 2012 Switchback and I put in a k&n air filter and also put on a SE nightstick slip on last year. Everything has been ok, but the other day I went to dealer and had them put on a open end end cap on the slip so I could get a little more noise out of it. I rode it all day and like the noise and the little more pick up I got. The next day the wife and I went out and half way threw the day I started hearing a rubbing, rattling noise. I can't put my finger on what it is or where it is coming from. If I'm on the highway and I hear the noise I'll let off the gas and it stops, when I put gas back on you hear it. I need some ideas before I go back to dealer. Help

 

Sorry, I just skimmed the posts but got the gist.

Have you downloaded another map? It's tough to get a good tune when you mix and match parts. I'm a purest when it comes to exhaust and not a fan of stock headers and slip-ons. Maybe call VH and talk to their techs about the FP3 and maybe they can suggest a better map.

Nothing a 113" or 120" build can't fix.

 

It's been 5 years, so hopefully the OP was able to figure it out. Or just another one and done.