guysk8r1717

went to install gw500 following all the diy's on here i have a 04 nav no cdc,pulled glove box and there is no prewiring for the cdc?now what? everything i have read is saying i have to buy a cdc and install it get the car programed for cdc and mp3 then install the gateway.? is that correct because when buying this from fantastic5 and reading from other members a non cdc nav no nav car would work fine with install... any help would be great, ive read so many posts on them and no one is giving a straight answer..