Ok so i revamp my setup this week and as a result have some spaRe parts. Most notably a 12ft IP-Bus to 3.5mm cable which can be used to hook your computer (in the trunk) up to any Pioneer Head Unit with CD chager input. Asking $50 CDN plus shipping.

also, one such head unit, Pioneer DEH-p3100 $150 CDN plus shipping. email for more info