they were made a while back for team gates when they ran kicker, they are look like kicker l7's but they weigh almost 50 lbs each, and the magnet/motor is completely different from the l7, they absolutely slam...... i dont have enought power or batteries yet, but the box was in a pt cruiser and hit in the 150's with 3 batteries and 2500 watts............... totally amazed.....