I heard it can be bad for your engine to remove the EGR system. Is this just b.s. becuase i thought the EGR was just for emissions. What exactly does the egr do?

 

EGR is used to reduce the formation of oxides of nitrogen (NOx), a pollutant. It accomplishes this by quenching (reducing) combustion chamber temperatures under certain part load conditions, like "lugging" the engine at low rpm in the wrong gear. Under these conditions, the EGR recirculation will also reduce the tendancy to detonate.

It never operates at full load/WOT, so it has no impact on performance.

 

The EGR re-routes some of the exhaust gases back into the intake/combustion chamber. This is basically done to reduce emissions. Blocking it off will reduce the temperature of the intake since the gases fed back through the EGR are very hot. Lower intake temperature produces more power, but the amount of gases that are passed through the EGR is VERY minimal and probably won't result in much (if any) performance gain. The drawback is increased emissions.

 

ok cool i got it now, thanks guys