Having problems with your 2004 BMW 6 Series ?
Can the stock sound system be upgrades - 2004 BMW 6 Series
Yes, go to Crutchfield.com and see what fits your car and what not. Then, when you receive your gear they will send you installing instructions. I did it, it's really easy.
Repair Help & Product Troubleshooting for 2004 BMW 6 Series
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