install 6x9 and 6.5inch

[dnasty88]

how bad would it be if i replaced these speakers without hooking them up to an amp?

[bronson96792]

to the stock or aftermarket deck??

[dnasty88]

aftermarket kenwood dnx5120

[bronson96792]

they will sound better than your stock speakers but to see real improvement u should hook them up to a 4ch amp, or u could hook up the 6.5's to a 2 ch amp and run the 6x9's off of your deck.