I would check for leaks in your exhaust system -I've read on other forums that exhaust leaks can cause popping and backfiring.

I had the HD shop put mine on.
I got the tappered style cycle shack slip-ons on my 1200C and I don't have popping on accel or decel.

I bought mine from Jireh Cycles - lowest price I could find.

 

Can someone with cycle shack slip ons tell me if there is a brackest that wraps around the pipe to join it to the header pipe. I have never noticed it on pics of peoples bikes but have noticed it on the dennis kirk website photo of the slip ons. I hear a lot of good things about cycle shack but dont want that bracket showing. Any help is appreciated.

 

I just used the stock muffler clamps that were on the stock mufflers. The clamps are covered by the heat shields.

 

Thanks Shoat that's what I needed to know. Makes sense now that I think about it the pics on the website didn't show a heat shield.