I've noticed the rubber pipe from the rocker cover to the intake manifold before, and haven't thought much about it, but I was reading of some problems with EGR systems, and to be they look similar. EGR results in reduced performance in exchange for less emissions, but does PCV have the same effect on the daihatsu engine? The crankcase gases arn't going to be improving performance, but do you think they are having a noticeable effect? On all the lorries I work on the crankcase breather just ends at the sump and blows the gas into the air. Can you think of any reason why doing this to the daihatsu engine would cause any trouble? You would have to block the hole in the intake manifold obviously. I am thinking of doing it because I'm not to hot about exhaust gases and oil going straight into the intake, for the sake of the planet.
Apperently on the Turbo engine the breather goes between the intercooler and turbo.