Review on Enhance Your Kleinn Air Horns with the BlastMaster Upgrade Kit - Unleash the Power of a Train Horn! by Jeff Diaz

I was hoping for further improvements. Not to say the kit I had was bad, but I thought it would make it significantly louder. I don't think that happened. I'm sure every application will/will be different. But I would recommend this product. I feel like this upgrade kit eliminates the complete inoperability of the speaker system in the event of a component failure. Now you can have a solenoid failure and still have a working horn.