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Message: <blockquote data-quote="MustangChris" data-source="post: 729253" data-attributes="member: 10830">Re: 98 cobra engine, COP conversion. i suggest a lightning force PCV filter. Its high quality and much cheeper/more durable than steeda's. plus this way you dont have to work woth steeda's tech support. loL!!!!i suggest keeping your PCV system in tact. once you hit higher horsepower, it wont matter as much, but at this point it does.The PCV system is the ventalation system to remove old, stagnant air from your crank case. It is open on two ends. One end allows air in, one allows air out. All the air used is *METERED* and *MEASURED* in a closed system. (jsut like your coolant, for example.)adding a breather cap (used to reduce crankcase pressure on boosted engines) will allow un-metered and un-measured air into the system, thus making it an "open" stystem, instead of a closed one.for the most part you can re-route the PCV in massive amounts of tubing, if you want to hide it in the fenders, for example. It may cause problems once you hit a certain length.</blockquote>