Ok fellas here it is from someone who has actually done it. I Installed the Borla Atak muffler 2.5 off center inlet to center outlet. Off the top of my head part number was 400826... I tested the sound absolutely no drone with flapper valve removed. Then to further testing I covered the mesh resonators and love the sound now. Perfect no drone whatsoever. 2020 LT trail boss 5.3 muffler shop charged $100.00 got the muffler for 230 on sale for fathers day