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I've been told the cat life is about 100k. My exaust was making a weird noise and I went to the shop. They told me I had a crack in my manifold just from the test drive. They came back, took off the shield and showed me a huge crack with exaust coming out of my manifold. A new sound started a couple of months later and they narrowed it down to a heat shield. They told me just keep it there and don't worry about it.
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