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      12-06-2012, 09:29 PM   #15
maxdriver
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Drives: '17 X3 35i, '16 AMG GLA45
Join Date: Nov 2011
Location: USA

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No clue if it improves performance. I bought it for the freaking sound! It's a BMW part....can't imagine that it lowers performance....having said that, my 135i screams...performance and sound wise....!!!