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There are two types of original equipment substrates: Pelletized, which consists of thousands of BB-sized ceramic pellets and Monolithic, which is a ceramic "honeycomb" style.

the insides are a thin coating of precious metals (rhodium, platinum and paladium) applied to the surface of the substrate material. Its function is to assist in the chemical reactions that are required to lower the emission levels.

2007-02-19 02:24:49 · answer #1 · answered by Larry M 3 · 0 0

Why?
Did you eat one?

2007-02-19 10:25:14 · answer #2 · answered by Mr. KnowItAll 7 · 1 0

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