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06 SLK55 AMG 99 CLK320 97 BMW 540I
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Discussion Starter #1
Hi guys,

Right now I hear a pretty loud raspy rattling under the car when stopped/idling. If I put the car in park the rattling goes away. I immediately thought Cat converters but I didn't get why I don't get the sound in Park. I know there is a "cat test" where I can tap on them with a rubber hammer and try and listen for a rattle, right?

Any advice/knowledge is greatly appreciated!
 
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