Catalytic Converter Clogged?

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Senior Member
Since I did my motor swap, it seems like the motor is holding back when going into VTEC. Some people have said the cat could be clogged. When beating on my car, when I stop I can smell something like rotten eggs. Would that possibly be coming from my catalytic converter??? My last crx HF smelled like that too. I was wondering if it was a "honda thing". Keep in mind my catalytic converter has about 170,000 + miles. thanks......