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Putting a hole in the EGR plate won't help with the Di engines. What I do know, when I had my Di, I was getting limp mode on anything about 16psi. I bought the HPD billet hi flow air flow meter housing. Also the hi flow lid they do. After fitting these I had my max boost set at 25psi and the cruise boost to 18psi and I never saw limp mode again. .
The best thing I did to that motor. Hands down.
If you want to drill a hole, 8mm is the hole size I used to do in the plates I sold when I had my shop.
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