My 2023 Transit only came with a single horn. The dual note horn is an option when ordering these vans. It may not seem like a big deal but the louder, dual note horns sound much better and it is a super easy, 10 minute project to upgrade it and its 100% plug and play.
You can order the Fiamm Dual Horn Assembly here https://amzn.to/3H3jYEV
Aaron's Customs LLC 