I want to install the thunderheader exhaust but have a few questions. Can I install them and leave the rest of the bike stock? ie..air filter and no fuel pak or power commander. Will the O2 sensors and computer adjust and put the correct amount of fuel in? I am riding a 13 FXDB. Thanks for the help.

 

You probably can . . . But you won't gain the perf
benefits from the TH that you would if you did a
Stage-1. At least change out the air cleaner.

If you're doing it just for sound? TH's don't really
sound that good on a totally stock bike.