Just finished upgrading my 2015 SV mip-mip horn. I went with "PIAA 85110 115db 400HZ + 500HZ Sports Horn" https://www.amazon.com/gp/product/B0006 ... UTF8&psc=1
. Only made simple wire harness for positive and negative terminals and reused original horn mount bracket after enlarging horn mounting hole on the bracket, so M8x16 bolt with spacer and lock washer fits and arranged both horns on the sides like a tree and original bracket as tree trunk, so when it is installed the original mount is vertical (it was horizontal with OEM horn) with horns hanging out off its top on both sides (kind of a triangular arrangement). this arrangement almost the same foot print as original horn as one of the horn is in front of the vertical radiator support, so air flow impact is minimal and the horn are almost symmetrical. The PIAA horns have integrated deflector so sound is pushed away to the openings in the bumper cover. Those horns are loud but only take 2.7A each, so no need for extra relay and they are very light.