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BMW M135i Aftermarket Exhaust Battle - By HK BMW M135i Owners Group
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12-22-2013, 09:36 AM
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ovekvam
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Is louder better? I thought the main purpose of the exhaust system was to reduce the noise.
I think it would have been more relevant to compare the noise under load than just revving in neutral, but I guess it would also be more difficult.
Appreciate
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