Header Installation - Abandon EGR Tube? - Acetone?

Remove it completely and block the hole left on the intake manifold with a set of block-off plates. Easy to make but can also be purchased. You can also reuse the factory nuts. This will have no effect on emission testing. No reason to use acetone. Acetone can actually make the fuel worse if the fuel is laden with ethanol. If you really want a good additive for cleaning, stabilizing and helping with ethanol (if present in your fuel) look at PRI-G.