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The noise arises on every Previa. The squealing isn't the muffler; It's caused by the flex pipe. Replacing your muffler will silence it temporarily but the noise will come back. the flex pipe, which is in front of the catalytic converter, is the cause. The noise has always been there; it's just more pronounced with the age of the van. a new exhaust system on my 1991 Previa has confirmed this. The noise just isn't as loud, but it's there. It actually makes the van sound like the Supercharged model. My 1992 Previa also makes the noise but there's nothing fuctionally wrong with it. I just live with it.
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