The Denali Dual-tone horn is a great replacement for the wimpy BMW horn. On my K1300S, I have the all-in-one version. S1000XR owners need the 2-piece version of the Denali Split Dual-tone Horn because space is tight in the S1000XR’s engine compartment. I also purchased the Denali S1000XR mounting brackets, the Denali plug and play cable, and the Denali wiring adapter for the horn. Continue reading How To: BMW S1000XR Horn Upgrade