PIAA HO-9 Horn, 330 Hz + 400 Hz, Superior/Bass Horn, Super Deep Bass, 112 DB, Pack of 2, Swirl Type, Compatible with Vehicle Inspections, Ground Harness Included

Not really compatible with gmc sierra 2021 as the port on these horn are different than gm housing, unless wanna cut wires its works

The sound is very good and it’s an excellent quality.

Un producto que no cumple con sus expectativas en lo más mínimo, después de atravesar un charco ya casi no se escucha parece que le entra agua suena como trompeta con voz aguardientosa. No lo recomiendo

Used this kit to replace the stock horns on a 2019 Tesla model 3. The original horns were badly rusted/corroded and no longer functioned. This horns work great, though I did have to slightly modify the horn bracket setup as I attached the bottom horn to the bracket bolt point, I also needed to use the Ford Spade adapter to connect to the horns. These horns sound way louder than the stock horns and I'm hoping they last a long time due to the dust/water resistance.

Met my expectations, exceptional loud horn . Comes with grounding wires 👍🏻

2026 Altima came with a single puny "Meep Meep." It didn't even say "Beep." These solved the problem! Nice low and loud blast that gets attention. I was finishing up the install and the wife came by on her lawn tractor - I gave her a honk and It startled her. That's what horns are meant to do! Great upgrade to the original at a really good price. Japanese quality should last the Life of the car.

確かに低音。 街中で他の車と音被りしないので、気に入ってます。