There's a way to replace the horn without pulling the bumper and looks pretty simple. The video isn't in English, but it's pretty easy to follow along.
No vibrations here. I did have to make sure to manipulate the hangers and such properly as there was one point where the midpipe was pretty close to the heat shielding and I could get it to make a noise by shaking the pipe. Got it moved to the proper place and I get nothing.
And yeah some of...
I don't find it that bad at all lol I have no worries of firing mine up and bothering any neighbors.
Can also skip the cold start by blipping the throttle or putting it in gear.
Lol wasn't paying enough attention to the pics in the instructions on how you put the bracket and pieces together for the valve setup and had one piece positioned wrong. Was an easy fix.
Crazy simple install. The most difficult part is putting together the valve bracket. I put it together wrong the first go. And don't forget that you can't test that the valve is working till the car is warmed up and not in cold start. I about took everything back apart because I thought I broke...