If you have loads of cash, you can install a COMAND system.


Pros:
1) Gives you navigation
2) Has AUX input
3) CAN bus diagnostics

Cons:
1) Pricey
2) Nav updates are limited

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2013 Volkswagen Jetta Hybrid SEL Premium (Sparky)
http://badges.fuelly.com/images/smallsig-us/193500.png

It's a car not a science experiment! Open the throttle!