do i need the h-d stg1 download and hi flow mufflers to run a hi flow air filter, also will it void my warranty to run a hi flow filter, 07 electraglide thanks

 

Yo will need something(sert,pc,tfi/dfo or the download)the enigne is real lean stock if you add more air then it will be really lean. I did the download route and what a waist of money- get the sert, pc or dfo.