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Yep, Diesel or gas, they wanted to reduce NOX emissions (oxides of nitrogen). Essentially, its heat. Thats why when you have a working EGR system, your EGTs are reduced.EGR valve re routes the un spent gasses to keep them from re-igniting.
Just like Rattlecan said,the new heads maybe ported for that,But,
I didnt know a diesl needed an EGR valve....
Nope, the engine can't distinguish between spent and unspent, it just runs a portion of exhaust gasses back through the intake stream. On a gas engine, if it isn't burning completely, the o2 sensors register lean (remember, the o2 sensors measure oxygen, not fuel) because of the unburned oxygen. But o2 sensors are downstream of the egr system.
I think you're referring to the EGR coolers on some diesels. Cool or not, you're stil running inert gas back into the intake.
