Quick speaker question

[me109]

I am looking at the infinity kappa 63.7i to replace my original speakers but they are 2 ohm impedance and the originals are 4 ohm.

Can I use them? If so should I do all four at once or can I do it in pairs?

[MazdaNoob]

what are you planning to run them with? ... is the amp 2 ohm stable ... or are you even running an amp ... if not then most decks can NOT handle 2 ohm

[me109]

No amp. All stock sound. So I guess I should probably find some 4 ohm speakers then.

OK thanks.