Exhaust blockage

huskerMember

Was troubleshooting a rattle in the exhaust on my wife's Subaru. Sounded like one of the mufflers. Had noticed the left muffler had less exhaust coming out prior to this. Pulled the muffler off and found about a quart of water in it. Ah, so this explains the rattle (probably rusted) and the week exhaust. Put on the new muffler and the exhaust still was significantly less than the right muffler. Pulled out the trust boroscope and found this stuff jammed in the exhaust pipe between the Y-pipe and the inlet to the muffler. Upstream of the Y-pipe is the resonator. The exhaust system looked like it had never been replaced. Anyone have any idea what this is?

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8/31/1811:47 AM

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