B&D, what make, model and year do you have? Just because it doesn't have an EGR valve doesn't mean it doesn't have Exhaust Gas Recirculation. Without EGR, timing has to be retarded to prevent pinging AKA spark knock. Bringing the timing back increases fuel usage, and no EGR increases oxides of nitrogen, the main ingredient in photo chemical smog. Catalytic converters have no effect on oxides of nitrogen. GM has eliminated EGR valves by going to variable cam timing. By going to variable cam timing the "power band" of an engine can be extended over a broader RPM range. EGR can be done more accurately with cam timing than introducing it through the intake where no 2 cylinders get the same amount. Removing a properly functioning EGR valve from an engine will not ever increase fuel economy or power. Most of the time it will have an adverse effect.
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Today's Featured Article - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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