Stock speaker replacement advice please

[jetmech727]

Well I found out the rear 5.25 speakers in my 6 CD factory unit were blown. I went and replaced them with 4 Ohm 6.5 inch units. I'm none to impressed by them. There not near loud enough, probably because there 4 ohm instead of the factory 2 ohm. I also just found out that the right front is blown as well. What a bunch of garbage they put in there at the factory. So thats 3 of 4 speakers gone. I'm not including the pillar speakers, there still ok. Is there a direct 2 ohm replacement I could use? I don't want to change the head unit or amp. I was fine with the way it sounded before, i'd like to get that back if I can.thanks