All I can say is WOW!! I came across this harness and I can't believe the difference it has made. I had a 2018 Raptor with the B&O system previously. On that truck I wired my amp by tapping into the rear door speakers with a simple Kicker KISL. Some songs sounded OK, and others were completely lacking bass. It drove me crazy. Fast forward, I just purchased a 2020 and ordered the harness with keyloc to fix factory roll-off. Holy cow what a difference it makes. I have the exact same Kicker KXA 800.1 amp and Alpine S type 10" subs that I had in the 18' but now it sounds amazing. The bass is consistent regardless of song, or source. Thank you!!