That was the very first thing I did as soon as I got my truck home. I ripped all the smog crap off and threw it all away! All these pipes that screwed into the top of each of the exhaust manifold port places on each bank. And all the hoses that went to all that and that went to the smog pump. I found some straight thread brass plugs to put in each one of those holes in the exhaust manifolds. I blocked off the EGR valve, more EPA crap, and threw the EGR valve in the trash! The PCV valve I kept. It has a function that's important. Anything other than the carb and the headers, not including the PCV, dist., etc., is unecessary. Rip it off your engine and get rid of it. Any gases your truck is emitting don't change the damn weather or cause starving in Africa! It's all nothing but government telling you what you have to have to drive down the road!