My dealer tells me anything from a power inverter, subwoofers, exhaust TIPS, body parts (grill), or anything non-BMW will void my warranty. I tried arguing with them many times, but they stick with what they said.

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2011 ///X5 M (On Order)

2009 X5 4.8 M Sport Space Gray/Black Fully Loaded

2007 GMC Yukon XL Denali Loaded and Customised