The Natural Philosopher wrote:
> The california spec MGB had no catlytic converter.

It didn't need to. As I said above a thermal converter sufficed to burn
off hydrocarbons and carbon monoxide.

> Air was pumped into
> the exhaust to reduce the *percentage* of CO and hydrocarbons to pass
> californias test.

No, they were not diluted, they were burnt with the extra oxygen that
was lacking in the engine itself.

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