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Originally Posted by chetanhanda  also the EGR valve opens into the intake plenum.
This maybe also adding stuff into the intake along with the PCV. |
Ya but you need the EGR to be there unlike the breather connection to the air intake which can be disconnectd cause it does not matter if you disconnect it. It's like an appendix operation. Organ doesnt do too much but can cause a whole lotta trouble.
EGR you need to keep there cause it keeps combustion temps down. So it's a necessary evil.
And by re routing the breather, imagine, no more sticky dirty fouled up throttle bodies, fouled sensors etc. Plus you also avoid hot air from inside the engine from going into the intake. I am sure there will be some gains, not too much though.