Quote:
Originally Posted by slimneverdies
I'm also curious to this. I don't need them but wouldn't mind throwing them on to help with pollution and that horrible carburetor gasoline smell. But do they or don't they kill some of your performance??
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If you have foul smelling exhaust, you'll overwork the cat and it'll melt down into a solid lump and plug up in one trip. A properly tuned well running engine is required if you need/want to use a cat. A modern converter has virtually no impact on performance, provided it has not been abused.
High Flow refers to the design of the catalyst. Modern converters are a honeycomb design often called "high flow". A large brick of very fine honeycomb like ceramic is impregnated with metals and minerals that act as a catalyst to speed the breakdown of gasses in the exhaust. Air flows through the honeycomb passages virtually unrestricted. Earlier designs were a large chamber full of ceramic beads impregnated with those elements and were quite restrictive. These are the wide flat converters with a plug in them where the beads were added. Often called "pancake" style.