Hi forum after some advice please

Ridin awsum 2011 Superglide love it to bits but dont have much experience with modern EFI techniques

Heres the background, after the initial runin and the supposed legal amount of time, Installed V&H slipons (all good sound good), upgraded air cleaner to sreamin eagle (all good again) on store advice had Harley service upgrade the EFI chip all good again except for the popping, pops between 1st and 2nd on accel and pops on decel all the time, now starting to get a very cool backfire as well, sounds good and it scares the pedestrians but its not really what i am after, have talked to V&H and they say you have to have to have their fuelpak where harley service says that its the pipes, i am due for the 16000k service in the next 2 weeks and i want to sort this out at the service but need the knowledge before i go in or i will just spend more money and wont really know what i am doing, hope this makes sense any help happily recieved.

thnks heaps Hilly for the feedback, just out of curiosity is there any reason to get the harley chip upgrade or just go straight to the plugin/piggyback tuner?

(just for future reference)

TTS: www.mastertune.net/