New header purchase.

[ZORA74]

In order to know which ones to get, what the heck are they and how do I tell which one I have? 99 Chevy Silverado 2500, 6.0l

[mcreyaufmiller]

EGR is the Exhaust Gas Recirculation valve, what do you mean by ari? A/C?

[Indy]

In order to know which ones to get, what the heck are they and how do I tell which one I have? 99 Chevy Silverado 2500, 6.0l

 

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I just bought headers about 6 months ago. The EGR header has a hose going to a fitting with two bolts on the passenger side, check your stock exhaust manifold. AIR is another fitting I believe on the drivers side header for trucks with California specs. It's an air injection system.