Line Noise Problem

[Arkhangel]

ok first off hi poeple. any and all help will be apretiated
Just got a new car, Toyota Yaris 2007 sedan
keeped the original stereo unit because its MP3/WMA and has an Aux input,
conected to the front out puts to LOC, then from there to an Audio Planet Preamp to split the signals; front, rear and subs.
from the preamp i have rca cable to the amps, 2 amps Power Acoustic one 4 channel 600w for front and rear, and one 2 channel 520w for the two 10" subs.

OK the stereo unit is grounded to its original place, the thingy that converts the wire is conected to where to preamp grounds, both amps are ground to bolt that hold down the rear seat. 2 of the rca calbes have ground wires, the ones that send the signal to the 4 channel amp, the sub rca cable doesnt have ground wire, the rca calbes that do are grounded to the block where the amps ground.. ok well that my set up,

the problem im having is noise in the system, basically everytime i excelerate you hear a high pitch whining sound, how can i eliminate this?