I just recently installed American Motors true dual exhaust on my 2013 Street Glide with V&H Twin Slash Rounds slip on mufflers. It seems like when I let off the throttle, there is what feels like a vibration coming from the motor area now. Is this just the difference from the stock exhaust to the true dual or is something not right with the new exhaust?

 

What else did you do to the bike? Stage 1, tuner?

 

Are the headers & heat shields properly attached?