Dension iPod w/ a CD changer
 

I've had the dension unit in my 2003 Boxster with a CDR-23 and NO CD Changer. Sold that car. Took out the Dension. Ready to install it in my 2004 Boxster S. The new car has Bose and a CD Changer. Directions are telling me I "might" need an additional part for a car with a CD Changer. Trying to make sense of this and I would think it would install the same way as it does as a car without a CD Chnager. Has anyone been down this road? Any insight? Do I need to order up an extra piece? Any info would be appreciated. -Tom