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When I cold start my 2002 300M with the 3.5L high output, it has a wierd exhaust sound. It almost sounds like a hollow echo sound to the fire of each cylinder. When it warms up, it goes away. I dont know if it has some kind of valve in the exhaust that helps it warm up faster and this is what is making the sound, but just wondering if anyone else knows what it could be. Thanks.
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