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The EGR system recirculates dirty unburnt emission gases back into your engine through the intake manifold which decreases performance, but improves gas mileage. You can bypass the EGR valve. Just buy a block off plate from you local speed shop. However, the EGR valve is there to cool the combustion chamber so without it, you will hear a lot of pinging until the motor melts.

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Q: Does it increase horsepower to block off an EGR valve?
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