yeah, the stock deck puts about 10 watts to each speaker... the alpine is going to be putting 27 watts RMS, 60 watts peak to each speaker...

the stock deck does not have the power to drive aftermarket speakers well... The alpine will be more than enough... just make sure you follow the directions with the deck and DO NOT connect the yellow power lead to the factory harness... rather, use the factory supplied power taps at the fuse box. Just above the fuses (inside the car) there are 4 or 5 recessed terminals... the one closest to the firewall is the one you want... run a 12 gauge power wire from there to the yellow power wire for the deck, then ground the deck to the dashboard frame, not the harness.