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mi7rennie
Exhaust gas recirculation should be fine to be blanked off, if it's present - it's an emissions control measure.
Secondary air injection is there to make the cats fire off sooner, so again - the only thing that takes a hit is (initial) emissions performance.
I've considered a catch can for the oil breather instead of routing it back into the intake tract but it the tradeoff in added complexity wasn't worth the (small) performance gain for me.