I've heard if you do not use a stage 1 tuner kit after changing your stock pipes, you will get popping? I had my V&H Big Shot Longs and SE Stage 1 tuner kit installed by my local dealer and I do not have any popping.

 

Talk to the owner, Chuck at Throttle City. He is awesome and very knowledgable. If you like what he has to say, then come out this way......it'll be worth the 2.5 hr ride.

http://www.throttle-city.com/

 

Exhaust O Ring?