So my buddy has a new Caliber with the premium 9 speaker Boston Acoustics sound system.

He's pretty happy with it but wants to know if he can hook up an Infinity Reference 10" instead of the factory 8".

Has anyone worked on this car before? Anyone know what impedance the factory sub is or how much power it sees?

He wan't to know if he can just disconnect the factory sub and create a wire extension to the 10" in a box and run it off of the factory amp.

Any advice? He doesn't want to install an amp and everything so its either this or nothing.

I haven't gotten in there yet to check the impedance on the factory sub myself.