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It's simple. People think that soot in the intake manifold after 30 years is unacceptable. They are so taken aback that they need to clean buildup after 3 decades that they defeat emission devices to attempt to prevent it. Others cite recirculating exhaust into the engine as nonsense and undesired, but they only expose their lack of knowledge regarding NOx formation.
Deleting the EGR has no performance gains, and the intake only requires cleaning rarely. Us OM60x owners could clean it when we replace the glow plugs every 50-100k miles.
In your reading, be sure to look at the legal consequences of tampering with federal emissions control devices.
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