FWIW...
GM's Duramax now has EGR made it slower along with a cat. Remove them both, performance is better than the previous LB7 motor. Slower how? Full pressure isn't coming from the exhaust manifold to the turbo... so they boost a tad quicker w/o EGR.
EGR wasn't on them from '01-04. Just '04.5+ when the LLY came about as I recall.
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I'm not a doctor, but I'll have a look.
'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k
Six others from BMW, GM, and Ford.
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