Squatting Dog
FRF Addict
Short version.
The oil catch can separates oil vapors from the gasses that escape the engine through the crank case vent (PCV valve) during normal operation. For emission reasons these gasses are routed back into the intake track to be burned up in the combustion cycle. Since most stock engines don't utilize an oil separator the oily gases coat the throttle body & intake track leading to carbon buildup. The oil can also cause pre-ignition by reducing the effective octane of the gas.
There are allot of factors that effect how much oil vapor gets vented from the crank case but running at high rpm's is one of the worst. Adding the oil catch can prevent the possible damage that the oil vapor will cause.
Just to add.. When you are in offroad mode, banging off the limiter, compression breaking into the corners... There is a lot of crap (oil, moisture, etc) that goes back through the intake... Clogs the canister purge valve and causes it to fail..
-Greg (aka squatting dog)