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282

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[–] 4 pts

Its Deionized water mixed with urea sprayed into a fine mist in the exhaust. The urea chemically reacts with nitrates in exhaust and catalyzes them into nitrogen gas

[–] 1 pt

Thx Im imagining an exhaust cleaning bong. And am like holt shit thats gonna kill HP.

[–] 1 pt

Lol percolation does clean things, but as you said, it would cause a restriction and negate the whole benefit. They do use the scrubber in some diesel applications where there can't be any particulate matter in the air, and the 1 HP loss is negligible.