Dude as Blitz will probably tell ya soonish. If you want to sell commercialy to this "market" why not become a trader?
This place is for Private Car parts and Accessories.
Read: Here
Do you have an aftermarket fuel pump? or a GTR pump? Assuming your car isnt a GTR.
The noise sounds
?Sounds like just the fuel pump priming if im not mistaken.
Should be fine. But this is based on assumptions
Pic of what I did with the stock plug and an EL Falcon oxygen sensor:
Btw NGK have a direct replacement for the RB25DET engine. Part Number OZA395-E2. ~$125 - $145 from repco
Needs some heat shrink around the individual wires will do that tonite.