i got the 400w 8鈥 under seat sub, works pretty good for what it is. you鈥檒l need 14ga wire min and connectors (should really come with it for the price though) install was super easy unit is very slim i could probably fit 2 under each seat side by side (f250 crew cab). it鈥檚 comparable to doubling the stock bass while keeping it clean! even at full gain and base boost. over all i鈥檓 glad i got this one and not another 4.5/5