Put them in and give them 80 RMS clean power and see. Their site doesnt have too many bogus claims on them, seems reasonable. Doubt they'll sound amazing, but if you have them, try em out, maybe they'll turn out to surprise.
put double rated power to them and you will be suprised how loud they get. i sell quantum audio and i have had 0 returns or blown equipment. great products for the money. in my last spl car i ran 2 5.25 componet sets of 600rms for a couple yrs no problems.