attempt to get under the car hit the cat with ur fist or rubber mallet. if theres a small rattle noise coming from it its starting to fall apart inside. but at 150,000 miles its probly in need of replacement soon anyways.
the engine sound the same as when the spark plugs are fouled by excess gasoline dumped in the piston chambers.
pull it out and look toward a bright light through the cat hole, the lesser light you see the higher concentration of crap is inside of it, which = time to replace. but at 150 i would replace anyways
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