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I think the performance exhaust system available only for the 6-cylinder engine models, Which I think makes sense because the exhaust system in the 50i model is already sporty enough and has loud and distictive sound. Even better than the X6M system.
This is according to BMW official website:
"The BMW Performance silencer system has a distinctive sound that enhances the sporty feel of the driving experience. Visually, the two chrome-plated stainless-steel tailpipes dazzle with their high-tech looks. Available for BMW X6 models with 6-cylinder engines."
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