I ordered 2 TM80 Strebel horns last week from Adventure Workshop and received them today. Everyone has to do what is best for them and this is how I did the install. The stock horn and TM80 look the same except the terminals of the stock horn are at the bottom and the TM80's are at the top. I tried my darnest to rotate the outer housing of the TM80 with the body but was afraid of breaking something. I discarded the grey plastic cover as it fit so loose I don't know how it could offfer any water protection. The TM80 mounted nicely inside the stock cow bell. The wire terminals from under the tank are exposed at the top of the cowbell where they weren't with the stock horn. Applied dielectric grease to the terminals. I thought the visibility of the wire ends would disturb me but they don't. The wire loom is tie straped to the backside of the horn mouinting bracket at the top.
And yes, the TM80 is much louder than stock!