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First $0 option is to just unplug the electrical connector that controls the exhaust valve. By disconnecting, it will just keep the valve open at all times, making cold start deeper and louder (kinda obnoxious). Exhaust should be slightly louder at idle and putting around town.
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2013 X1 35i xDrive / ER CP / Wagner Evo 1 IC / Wagner Catted DP / MHD OTS / xHP stage 2 / Mishimoto OCC / 12mm H&R Spacers
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