if i get 2 10" kicker impulse subs and i also want to run my 2 6"speakers in the front doors how power full will my amp need to be. the front speakers are 160w max pioneer dual cones subs i think are 600w each max

Are they 4 ohm or 8 ohm EXs?

i have no clue i am picking them up tomorrow night, all i kno is that they are 140wrms each, also i was told that i should get seperate amps for subs then 6" because they run diff frequencies is this ture? i kno lots of people that have hooked up front speakers and subs on same amp.

You can run woofers and speakers off the same amplifier. But things you should keep in mind are: - Are there enough channels for everything? - Are the speaker channels able to be highpassed, is it variable? - Are the subwoofer channels able to be lowpassed, and is that variable? - The subwoofer channels actually match the impedance of your woofer's coils. - You have ample power to drive the woofers.