I BOUGHT A HORN OFF "FLEA BAY" WHICH IS CALLED A STEBEL MAGNUM T-80 W/ 139DB 12V. WHEN I SWAPPED IT OUT W/ THE OEM I DIDN'T USE A RELAY LIKE THE DIRECTIONS SAID TO. I ASSUMED MY BIKE ALREADY HAD ONE. IS A RELAY NECESSARY FOR THIS HORN? IT SOUNDS DIFFERENT THAN WHAT THE WEBSITE GIVES ME @ WWW.STEBEL.IT ANY HELP WOULD BE APPRECIATED. I WAS TRYING TO ACHIEVE A LOUD SOUNDING HORN AND THIS ONE IS O.K. COMPARED TO STOCK. THANKS