Well I tried a new one with a two tone pitch and it was rated at 105 db. This worked when I applied 12 volts to it, but once it was installed on the relay it wasn’t any good. Sounded as if there was something stuck on the speaker making it sound muffled and crackly. So I tried the 273-075 and it was about the same as the 273-060 I had installed before. Being that I could not tell the difference I decided to leave both of them installed. Although this did not make it any louder per say it did make the pitch just a little deeper and thus made it easier to hear though the hood.