I've heard from a few performance heads where I live that I should disconnect my EGR valve and cap it. THey said it takes a lot of intake air from the vaccum effect. Is this true? Has anyone done this?

 

Some will tell you that the EGR actually HELPS performance by reducing spark-knock and letting you add more timing. My gut instince is that re-introducing exhaust gasses into the chamber probably isn't doing us any favors. Hell, if we really need non-combustible materials in the chamber, isn't that why water injection was created? Seems odd that none of the automakers have used that in production, doesn't it?