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EGR VALVE,SECONDARY AIR CLEANER,BOTH CATS,ALL VACCUM HOSES HOOKED UP RIGHT...

 

What he said. I'll add though, that one cat will do just fine as long as the EGR and charcoal canister are present. I've passed Cali smog with just one cat.

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secondary air cleaner adds fresh air in cat to help un burned gas when letting off gas..IT opens a reed valve for fresh air to reduce H/carbons....

 

 

It introduces air to the exhaust before the precat to help burn unburnt fuel when the engine is stone cold cuz the injector timing is in open loop.

 

But it doesn't do jack to pass your emmissions test cuz the engine is at normal operating temp and the cat is hot during the smog test. It's not needed.

 

For What It's Worth.

 

KEN

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