agree on the filter behind, but it was an accessory item so might have been put anywhere the installer decided - never seen a TF with the horn on the firewall, all have been off the rad core support, single one behind and to the drivers side, or both sides w/ 2, that's what the louvers are for there, the horn mounts so the bell end is right behind them, as per the accessory manual

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics