4) Kicker 40CSS654 6.5-Inch 600W Component Speakers Systems CSS65 (Pair) 2 sets Kicker 40CSS654 6.5" 600 Watt Car Audio Component Speakers Systems CSS65 RMS Power: 100 Watts (200W per 2 sets) MAX Power: 300 Watts (600W per 2 sets) Impedance: 4-Ohms Best value drop-in upgrade