Replaced my spark plugs at 60k. I know there rated for 100k but with aggressive driving and abuse of extra boost I'm changing them early for peace of mind. Easy enough for anyone to do just have to remove charge pipe off the turbo to gain access to the coil packs. Make sure you get a thin walled 14mm spark plug socket, I originally bought a 14mm spark plug socket from advance Auto but wouldn't fit, so Amazon had one for $11.
OE part number : 22401-1KC1C
NGK : DILKAR7C9H
$18.90 each at local Nissan dealership
What does everyone think of the plugs that came out?