HPD oil catch cans / oil air separators prevent oil from entering into the intake manifold and mixing with the exhaust gases from the EGR (Exhaust Gas Recirculation) system.
The mixture of oil & exhaust gases creates carbon build up in the inlet manifold (see picture in listing) blocking vital components like airflow sensors, map/boost pressure sensors etc, reducing power and torque as well as increasing fuel usage and potentially causing damage.
A quality Catch Can helps to maintain optimum performance by preventing build up of oil deposits in intake, piping, manifold & intercooler.
Modern 4WDs tend to have more sensors in the intake manifold and EGR valves that can malfunction due to the oil film & carbon deposits produced.
The HPD direct bolt on separator kits are ideal for 4WDs running an intercooler or turbo kit and they come complete with mounting brackets, rubber hoses and hose clamps. The separators eliminate oil vapour that can contaminate the intake system and therefore helps keep the intercooler clean (internally). This translates into more efficient cooling and better power delivery from your engine.