Thread: Exhaust
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      12-19-2020, 03:23 PM   #92
jad03060
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Drives: X5 45e
Join Date: Aug 2018
Location: NH

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FWIW, in the US, making changes to the emission controls can get you into trouble. The flap is there to help the vehicle warm up quicker by getting the catalytic converter up to temperature faster. In the meantime, you're going to be spewing more emissions than you should. All this for a little cold start improvement in sound?
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