there is literally no bass because the oem amp is wired to push the dual voice coils which drops the ohm load to give more punch. After market subs in 6.5" size are not dual voice coil so there is no way to drop the ohms as in an oem setup (unless you bridge the oem amp but I read that it is not able to handle being bridged) so the aftermarket subs are under powered.

I am waiting to get an aftermarket amp now.