I delete EGRs on my diesels for cleaner intake manifolds.

On the OM601 the Euro 2.0 with no EGR and the use 2.2 with EGR are rated at the same power. I could see there being a slight improvement. With it deleted on all of my Mercedes diesels except my 602T in my 92 (once the electrical system is finally sorted out a wastegate swap is in order), I have noticed cleaner intake manifolds. Maybe a tiny bit more power on my 602 and 601 NA motors. Haven't noticed a measurable difference in mpg, nor a measurable difference in power. If your intake is plugged up with soot you will notice a loss of power and mileage, but its not the egr running that's directly causing that, its an externality of the way it works.

I guess the net effect of what I am saying is, if you unplug your EGR, don't expect to outrun E55s on the highway, and pass prius' at the gas pump simply because you got rid of your EGR.

I get rid of it on my cars and have noticed no downsides, but its also not like the holy grail of modifications, its probably not going to change your life.

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