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Originally Posted by ChevyHighPerformance
Don't loose sight of other sources of dirt in the engine. For those of you with the stock intake, stock filter, and stock exhaust - rub your finger around the inside of the tailpipe. That black soot came from the combustion and made its way past the cat in the exhaust manifold, past the main cat, past the resonator, and past the muffler. This is just what made it through all these barriers - think what got trappped. The size of the particles in this soot ranges the gambet in sizes. Some of this soot gets trapped in the oil, somes makes it past the oil filter, gets pumped through the bearings, etc.
Clean the tail pipe and drive through a tank of gas and see what soot came back. I'll bet that this is more dirt that gets past the K&N in that same amount of time.
There's junk in the fuel that gets past the fuel filter too.
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That black soot is called exhaust. It has nothing to do with external dirt, that soot is Hydrocarbons as a by product of combustion.
