What is the purpose of a catch can?.....To eliminate any oil being put BACK into your engine HOPEFULLY by trappin it in the catch can......To do this you need a vaccum source to suck the oil out of the engine through the catch can and back into the intake. Most people use the intake as a vaccum soarce because it is the easiest way and its they way they do it from the factory. No matter what catch can you have you will always be contaminating your intake air if you route it this way.
Also if you run anything through your PCV valve you are just dumping bad crap into your motor. The 2.0 guys have it easier as they dont have the extra CCV that the 2.5 guys do. Therfore that is why most people claim that 2 catch cans is best to handle the other CCV. So what is another source of vaccum on our motors other than the intake pre turbo and intake manifold(pcv) ????? The EXHAUST!
I have my open valve cover vents looped to eachother and my baffled ones "T"d with my 1 CCV run to a catch can and the catch can is then bunged in downstream after the stock 02 sensor in the exhaust. My lines are also overly LARGE (-10an). To me. This seems like the absoulute best way to run a catch can. You have no way of contaminating the motor and your are getting the required vaccum from the exhaust to take the excess oil out of your motor..........
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