Well, not into the noise polluting thing, particularly from motorcycles which, especially the HD variety, are TFL already
However, your speakers merely have a peak power rating of 500w, and a continuous program rating of 125 watts. The sensitivity spec is a better indication of how much amp would get you how much spl. They're 4 ohm speakers so make sure you use an amp rated accordingly. Try using the
how much amp calculator here
Have no idea where you'd even put an amp on a motorcycle....