anyone know an online resource that would have full tech specs on factory head units. i am dying to know whether or not my honda;s unit has an aux

thanks

This implies that you HU is capable of accepting an after market CD changer.....but you just want vanilla RCA inputs.
Which would make this exactly what you want - if you had a '98-'02 Honda Passport.

To get the full specs of the HU you might have to pull it from the dash and find the mfg details and model numbers, and then start using google. But, and this is just my humble opinion, I doubt it has an aux input.

As soon as my friend gets online I'll let you know any possibilities he used to install car stereos and is the head hancho over at team-integra.net