I have a 2001 pontiac sunfire with the sun and sound package, I am wiring a carputer to replace my stock headunit.  I am going to tap into the speaker wires to put sound through my pyramid 800 watt amp.  I plan on keeping stock speaker
First question:  Is the impediance of the stock speakers 2 ohms?  If not what is it?
Second question is: With the Sun and sound package i have more than 4 speakers, are they still only wired through four inputs.  I have found this:
Memory (+12v Constant) Orange 
Ignition (+12v Switched) Yellow 
Ground (-) Black 
Illumination Gray 
Dimmer Brown 
Power Antenna Pink 
S p e a k e r s 
Right Front (+) Light Green 
Right Front (-) Dark Green 
Left Front (+) Tan 
Left Front (-) Gray 
Right Rear (+) Dark Blue 
Right Rear (-) Light Blue 
Left Rear (+) Brown 
Left Rear (-) Yellow 
It let me know what each color wire the speaker was connected to.... but if i have more than 4 speakers are they wired on different colors.  I know i have 2 1" tweeters in the front along with like 2X4 1/2", and 2 6X9's in the back.  If i tap into the 4 know speaker wires will everything else get sound?
thanks
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2001 pont sunfire w/ 733 celeron, 512 mb pc133, 120 GB hdd, and a 8" lilliput touchscreen
http://www.home.cwru.edu/~abf