After some research I found that my 2005 Dodge had a unique factory Infinity system. I desired to change out the head unit but I required a special interface cable. The Metra 70-6510 did the trick and allowed me to bypass the stock amplifier that was otherwise unusable. Sonic Electronix gave me good advice and a prompt refund for the incorrect part I originally ordered. I highly recommend the product and Sonic. This quality is rare these days. Thanks, Sonic!