nissan tried to reduce the 16v head from retaining oil and not draining back to the sump so added loads of louvres in the splash plate to allow oil flow back into the sump pan, and removed material around the pick up too. Trouble is that when the grip and or performance is increased, the oil can forced away from the pick up under cornering/braking etc. The louvres also allow the oil to surge to the back of the pan and away from the pickup under hard acceleration. If you are using a det sump, i reckon closing up every other louvre and added a plate around the pickup copying the ca20 version. If you add wings, be careful, as you will need trapdoors that are sprung or the extra oil will just surge and end up splashing all over the crank causing other issues. Ive bought an accusump instead, just to give 10-15 seconds of oil direct into the main gallery if i get surge