Easy assembly - I simply removed the old horns and screwed these and the accompanying woofer onto the same stand. The wires were labeled and I was able to connect them correctly without any problems. All in all, the job took about 20 minutes. I wanted a loud horn and this is LOUD. This afternoon my daughter turned on the car alarm, it was loud from 50 feet away. When we got within 25 feet of the car, my ears hurt (a little). I don't know how long they will last. The last set of horns I bought from Auto Zone only lasted about 4 years. Don't buy a recommended relay unless you're really sure you're going to need it. Revain has 'recommended' it as an item often bought together. The relay didn't fit my car and wasn't needed since most cars already have a horn relay! It's one of those things you buy and shipping costs the same as the refunded purchase price, so I have a new relay that I can't use. I will keep it and probably pass it on to my kids so they never get to use it. Update - I bought another set of high and low blasters for another old car I bought. Easy to install. Loud as hell.
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