Guy, you may be right. But I have always been told that with high revs in mind, a better oil pump is needed, especially when we are talking about bigger turbos! There was a debate before on this board about the necessity for this pump when I posted what I wanted to install in my car. Tuners over here refuse to do big turbo jobs on any GTR without the oil pump being replaced with "better" ones. So, at the end, being a sucker for reliability, I opted for the HKS pump. Cost an arm and half a leg!
On start up, I notice there is high pressure (about 5 bar). I suppose that's good as it ensures my engine is not starved of oil at start up. On high revs, it goes to 6 bar or thereabout. So far so good though.