I fitted a stage one kit and Super Tuner Pro to my 2015 Fatboy using Screaming Eagle mufflers and filter, at the same stage downloading the correct tuning file for the stage one kit, it actually ran very well. I changed the mufflers for S&S turbo's and while it still runs fine, it pops and spits on closed throttle, anyone know why, is this normal and how to eliminate it?

cheers, John

SEs are not as 'open' as some ...

Consequently, my money is on the need for re-tune.

SE's are not 'open' AT ALL
the newer SE's are somewhat very restrictive

My bike when fitted with the S&S did the same untill I had the bike dyno tuned, now it run perfect no pop at all.....

Harley tuner runs lean which is the main cause of popping if there are no air leaks on the exhaust, get a tune up.

dyno tune for sure