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Old 10-15-2011, 11:51 AM
NOVAwhiteX5M NOVAwhiteX5M is offline
Join Date: Dec 2010
Location: USA
Posts: 33
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this is actually an 'enhancement' on the e90/e89's with the performance package

Developed in-house by BMW's engineering department, ..... and add an exhaust "burble" during engine overrun.
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