Dohmar, this is what I found:
And the N1 does have the anti-cavitation plate installed.
I personally run the N1 water pump and have done alot of on/off driving in heavy traffic on 38+ degree days. The temp. gauge hasn't creeped up at all... then again, that thing doesn't unless it's servely over-heating lol.
I did notice that after installing the N1 pump, if it's a cold night outside, the temp gauge does down to under a quater - with the old pump, even if it was 5 degree's outside, it wouldn't budge from half way.
If you haven't overhauled the water pump, even with a stock one, I'd suggest replacing it even with another stock one... unless the previous owner already did? They usually do in the 100,000k service.