I've installed Hella Twin Tone Trumpet horns on all my cars:
HELLA 3399801 Supertones compared to factory horn and HELLA 7424801 Twin Tone Trumpets.
Subject: 2011 Kia Forte5 SX
Skip to 6:17 for the horn comparison.
HELLA 3399801 Supertone Horns compared to HELLA 7424801 Twin Tone Trumpet Horns.
Subject: 2011 Kia Forte5 SX
Skip to 2:17 for the horn comparison.
Something I should mention is, since doing this conversion, I was made aware of a kit available on Amazon that uses a special pigtail harness that allows you to just plug into the factory connector and then into the horns so you don't have to cut the factory connectors off:
Buy uxcell 2Pcs Plastic Car Horn Speaker Adapter Wiring Harness Pigtail Socket for Hyundai: Speaker Wire Connectors - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
www.amazon.com
You don't NEED to use a relay but I chose to. This is the harness I used to install the horns:
Buy iJDMTOY (1 12V Horn Wiring Harness Relay Kit Compatible with Car Truck Grille Mount Blast Tone Horns (Actual Horn Not Included): Wiring Harnesses - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
www.amazon.com