|  | K&N Valve Cover Breather Filter
Turbo cars generate positive pressure in the crankcase (through pressure leakage from the cylinder, mostly), and so a significant amount of pressurized air and oil vapor are blown out the positive crankcase ventilation (PCV) breather valve. This is normally plumbed back into the intake, which is good for keeping the atmosphere free of oil vapor, but not so good for your intake system. Oil tends to accumulate in any low points of the intake. If you've pulled off your intercooler and found two cups of oil inside, you know what we're talking about.
A fix for this is to just remove the hose that leads back to the intake. A simple K&N filter on the PCV valve outlet allows you to do this without worrying about junk being sucked into the hole under vacuum. This doesn't directly increase horsepower, but can prevent loss of horsepower from a gummed-up intake tract.
Mind you, venting your crankcase to atmosphere is against the law for street cars, but for cars that will only see track use, you can install this teeny, fully functional K&N filter. It looks just like the big filter you have on your intake, but scaled down. NOT FOR USE ON CARS TO BE DRIVEN ON PUBLIC ROADS.
Updated 9/08/02
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