The EGR only slightly reduces the combustion chamber temps to reduce NoX. However when you reduce NoX you increase CO2. They are diameterically opposed, raise one the other lowers.

Now he says you will warp your valves with fresh air. Hogwash! What about the Cummins it does not have EGR. I dont see any warped valves in them. Having the ERG disabled will not hurt your valves. Also cars ran for 50 years with no EGR. Hmm.....

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1981 300D 147k
1998 VW Jetta Tdi 320k
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1979 300D 234k (sold)
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