If you have ferrous metal inside your intake, it is serious. While the block and heads are alloy, the valves and other internal components are ferrous. You might be able to use a bore scope inserted into the intake to learn more. I seriously doubt this is IMS related, but you will not know until the engine is out and apart.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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