Discussion
Which after treatment device do modern direct injection petrol engines carry?
Answer: D
A wall flow filter of the same principle as the diesel version traps the soot. It genuinely is the same technology adapted, which makes the second option a near miss distinguished only by its name. Catalysts do not remove particulates. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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