I'm pretty sure the BRZ and FRS horns are identical, and I can say my OEM FRS horn sucked on the freeway too. That was the primary motivation for going with the 118dB Hella horns. I have to say that although the Hella horns are really [hella
] loud while parked in my driveway/garage, it still doesn't sound all that loud on the streets/freeways.