The OEM unit was less than adequate for me. There was no way to properly connect auxiliary devices. I quickly swapped it out for something that would. Now I have:

• AM
• FM
• HD Radio
• XM
• Blue Tooth Audio
• USB
• Integrated iPod
• Blue Tooth hands-free Phone
• CD
• 3.5mm input (for everything else)
• additional powered sub woofer
• four additional rear 2-way speakers
• built-in EQ

The crossover tip fixed the doors speaker muddiness.

It's a whole different car. I'll be deaf by 60