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I recall reading an article somewhere where someone was saying that PCV is likely the reason for gunk because external EGR isn't very common these days.
In that case I wonder if Porsche owners see this issue to a lesser degree, because their cars all have dry sump lubrication which in theory should not be allowing as much oil to go through the intake since the sump is a huge catch can. I know for typical cars if you drive them hard the intake will get dirty with PCV crud; I had my brother rev my car's engine while I tried to diagnose a rattle once and I noticed that at 5000rpm and up as soon as he let off the gas a puff of smoke would come out the exhaust, which has got to be oil. If I were buying a new car with wet sump I'd probably have a catch can ready to go on knowing this.
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