EGR Block-off kit? Is it worth it?
 

I saw this while perusing an on-line catalog. Does this improve anything? Sounds like more gasses would be going by the O2 sensors - SES light or clog up the catalytic converters?

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'99 Z28 A4 BLACK
▪ SLP air lid, K&N filter, air box mod, Borla exhaust, HPP3, 160* stat, Magnecor 8.5 mm wires, NGK TR55 plugs
▪ Pioneer DEH-P77DH, Polk speakers