After a year or more of trial and error I have found what is the best combo for my FLSTC, Vance & Hines True Duals with Big City Thunder Monster baffles. And yes there is an increase in performance like they said!!! The sound is definitely low, one you can feel, and still loud!!! Install them as per their directions and you'll be happy with them.

Thanks to members of this forum for all their input and advice.

 

How about posting a video with some sound? I'd love to hear 'em!

 

Was additional drilling necessary or did they install in the same location as the stock baffles?

 

Exactly, the old "This Thread is Useless without Pictures". And in this case, Video!

 

another happy camper, would like to hear so of them also...

 

right on...it's nice to find the right sound