I have a 94 camaro z28 LT1 just bought some headers but they didnt come with the EGR hook up. WHAT WOULD HAPPEN IF I PLUG THE EGR PART.

 

You will eliminate the exhaust gas recycle (EGR) system. The primary purpose of EGR is to cool combustion chamber temperatures, to reduce the formation of the pollutant oxides of nitrogen (NOx). EGR is only used under operating conditions that promote high combustion chamber temps, primarily when lugging the engine at low RPM. Does not operate at idle, does not operate at WOT, does not operate above 3,500 RPM.

I side benefit of the EGR system would be the reduction of the potential for detonation (knock) under the part load/low RPM conditions.

Removing the system will increase NOx, possibly making it harder to pass a rolling emissions test, and may lead to minor knock retard issues when lugging the engine at too low RPM, in the wrong gear.

Removing the system may set trouble code DTC 32 for low EGR flow. The OBD-I diagnostic for EGR flow is not very sensitive, and does not always pick up removal of the EGR system. If you do get a code/SES light, the code can be "programmed out" of the PCM.