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Isn't this a compressor upgrade on the stock center housing?
Isn't the stock center housing have some kinda built in restrictor?
Anyways, I wanted to comment on the "bigger is better" notion...
Actually, the reality is opposite.
With the kind of engine (oil) pressures we run, it's closer to 100psi or even over.
Smaller is better.
What happens if you go "too big?"
I knew a guy who tried to run a -6 on the oil feed into the turbo - some Garrett T4.
He ended up spinning the front (stat gear) bearing, because too much oil was being diverted from that area - notice the turbo oil feed primarily comes from that area.
So, yes, in this case, more restriction is better than more flow...
As a rule, don't run anything larger than a -4; a -3 is actually better for the turbo oil feed, in this case.
-Ted
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