No, you don't need to attach the smog pump line. I just took a rubber hose and a big bolt and pluged it up. The gasket should be enough to seal it off but, I put some of that copper stuff out of a spray can on the gasket. The easiest way to do this install is to is to cut the old exhaust out and the new x-pipe will fit back in without removing the cross member(if you don't have cats on the new x-pipe).