clicking links is hard. Here are the pics.
On the GTIR there is only one oil hole here.
Here is the Ve pump. You can see 2 oil holes in the same place
Take notice here on the back. The oil inlet on the VE has roughly a 30* angle slope in it right about 2" inside the pump. The GTIR hits about a 80* angle. The flow characteristics of the VE pump are improved here. Too bad I couldn't find a working VE pump.
Here you can see a slope for the oil to smoothly enter the pump.
But on the GTIR pump you can see the oil practically hits a wall upon entry.
You can see from the outside of the GTIR pump the sharp turn in cast into the pump.
So the differences are noticeable but considering how many 90* angles the oil has to pass through inside the block, the flow difference is negligible. Once the oil comes out of the pump it has to turn 90* 2" into the block in order to go through the oil filter housing and another 180* to get back into the block. Go ve pump when you can, but if you can't you prob won't notice a difference unless you are revving really really high.