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here's what's stated in the BMW owners manual and it tells people all they need to know about modding ANYTHING on their car...
"This warranty does not apply to the following:
...Modification of the vehicle or installation of any performance accessories or components attached to the vehicle which alters the original engineering and/or operating specifications or which result in damage to the other original components, electrical interference, electrical short, radio static, water leaks, and wind noise. "
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