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That's simply an uneducated statement. EGR has been in use for 50 years and it's benefits are well known. The "appearance" to your untrained eyes notwithstanding, the SCIENCE of EGR is well documented and it will result in better emissions and improved fuel economy. GD

If you can hear detonation on a Subaru engine, you have already FAR exceeded the point at which you are potentially causing damage and really Subaru engines should be kept below the point that any detonation is audible by the knock sensor. GD

on some, it's under the shift trim like this;

Still - things have changed so you should check it with a shop gauge. Could be an issue with the sending unit. And the FSM and Owners Manual both state that seemingly zero pressure at idle on the "trim package" is "normal" and expected operation. The General Rule for oil pressure is 10 psi per 1000 RPM. Of course we generally like to see it higher than that, but that's the generally accepted number for operation without damage. GD

Thanks mate, already noted. I totally forgot about the wedge, like much of society!