[bigd65]

if eather of them loose the vacuum load, they are bad and have cracked diagfram's (wow, i miss spelled that) as far as the EGR and if you can run without it. if i'm not mistaken and from speakin from experience. if you keep your old manifold you will need to keep the EGR to be able to run on 87 octane,because of the exhaust crossover under the intake. now if you change to an intake, like the AIRGAP's, they dont have the exhaust crossover under the intake, therefore no EGR. without the crossover under the intake, it keeps the intake cooler, therefore a denser fuel charge and can still run 87 octane