Ok, so I have this old beat up 95 villager with an aftermarket kenwood head unit (http://www.kenwoodusa.com/product/product.jsp?productTypeId=20&productId=694). I want to put my rio in the car but I'd rather not buy an amp and new speakers, so I was thinking that maybe I could use the amp in the hu instead. The kenwood doesn't have any rca inputs, however it can accept a kenwood (or compat.) cd changer so I was thinking of buying this (http://www.rcainput.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=RCAI&Product_Code=kenwd_aux_v1&Category_Code=K) and then using it to connect the rio. Would such a thing work? If I hook that to the rio, I'm guessing that takes care of audio, but what about power? The only stuff I know about car audio is what I learned watching my friend install the kenwood to begin with, and that isn't much. So is this something I could possibly do or should I buy the equiptment and have a professional do it? Can it even be done? I remember talking to my friend and he said either it's not possible or that he'd have to run a wire through the firewall.

Thanks so much,
Evan