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i have a 99 c230k I heard that its normal for the supercharge or the engine to be loud when im warming up my engine in the morning after about 20-30 second than it quiet down and engine sound normal. But when im taking off and have the window down i can hear the noise sound like an exhaust leak coming from where the supercharger is at.every time i press on the gas pedal the noise is there.I only hear it if there something there that would echo the noise back like if there a parked car or the center divider. plz someone let me know if this is normal for this car or model
 

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I think it's the sound of the bypass valve

he it's under zero degrees in winter and the supercharger/air discharge is pretty loud when car is very cold

Etienne
 
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