I bought a USA-spec ipod interface for my 2003 with DSP system, it hooks up to the CD changer connection in the trunk, the interface box is under my front seat, and I have a dock connector cable run into the armrest. Charges my phone/ipod as well as lets you have direct control and playlist control.

Bought it from Crutchfield actually, and had a coupon so I paid 135. Works like a charm, and much better than the AUX connectors in my opinion since it plays from dock and charges too.

let me know if you want any more info man

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards