Honestly man its your own rig. I personally would not do it. But the stock toyota horn is weak and I'm replacing them with chevy horns off a 88-99 chev. Do what you want just think of the few hundred spent on train horn compressor lines ect... could be money spent other places or saved for school.

Train horns are not for replacing the stock ones.. Matter a fact it has nothing to do with road use IMO.. It is a toy and just like any toy, it can and will get expensive like Seabass has pointed out..Just like lockers, low gears, big tires, and so on, do you need them? no..  do you want them? Some say hell yea!!