[morgal48]

Assuming you replaced the Haes 4X40 with the Haes 6X40, replacing the door speakers may (will) lead to disappointing results. Both factory amps have a low pass filter set ~50Hz, so you won't hear any frequencies above that threshold. Installing a 5-channel amp and wiring the doors in series will result in 1-ohm door speakers. And more pleasing results.