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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 12-26-2005, 07:50 AM   #1 (permalink)
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Exhaust Problem... maybe

I was hoping you folks could help me with a diagnosis issue.
I recently bought a 99 540i Station Wagon with 77K miles. The exhaust seems to be louder than it should when I accelerate. I had it put on a lift and the mechanic said that there was no exhaust leak at all. He suggested that I go to A BMW mechanic.

Here is the strange part of the problem. When it is raining an I go over a puddle the noise gets very loud. It is also directly proportionate to the size of the puddle. The bigger the puddle the louder the noise. The increase in noise only lasts a few minutes (I guess until the water evaporates. I am taking it in for service this week but I was hoping someone on this forum would have some insight.

Thanks
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Old 12-26-2005, 07:53 AM   #2 (permalink)
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Welcome to the site...

Thats an interesting problem... honestly I dont see how water can make your exhaust louder... nor have I ever heard of such a thing... unless you have a huge leak that would allow the water to enter. As for the loudness... I'd probably say replace your exhaust if you want something quieter. Many stock BMW exhausts are loud to start with... to some people's ear.

Good Luck,

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Old 12-26-2005, 09:22 AM   #3 (permalink)
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Does anyone think It could be an issue with any type of bearing. Maybe water getting on it would make it louder?
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Old 12-26-2005, 09:59 AM   #4 (permalink)
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That would make a different type of noise... the way you word it... as if it is a exhaust noise... nothing mechanical about exhaust noise.

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Old 12-26-2005, 10:39 AM   #5 (permalink)
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Like Les said, BMW exhaust will seem pretty loud to some people, especially if your car background is American cars. Regardless of what exhaust you have on it, that 4.4 V8 will make some noise.

Emir

ps. Are you sure you don't have some sort of aftermarket exhaust? I'd love to see soem pics and maybe a sound clip.
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