http://www.expeditionportal.com/forum/showpost.php?p=356105&postcount=27
This is from when I did it:
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Ok, Done with the plug and wire swap.
Spark Plugs
I went with the OEM Champion plugs, these are the exact same plugs they sell at the dealership for a 2001 DII.
Plug ID # is RC11PYPB4
Champion Stock # is 7070, sold in boxes of four.
Dealership price is $19 per plug.
Most Land Rover focused online retailers have them for $12
NAPA price was $5.49 per plug and they were in stock, thanks NAPA!
Spark Plug Wires
Magnacor 8mm
Inventory # 80242
Note that the stock wires are 7mm, the extra mm gained from the 8mm wires is insulation which provides about 100 degrees of additional temperature tolerance for these wires, extending their life. These are highly recommended on all of the Land Rover forums and have proven to be a solid substitute for OEM wires.
Most online retailers have them for $100-$111, Magnacor sells direct to the public too and quoted $130 for the set before shipping.
I purchased my set from Apex Performance .com. They sell them for $85.90 and I used a 10% coupon code from a BMW forum, for a final price of $77.
This is compared to the dealership price of $45 per wire, $349 for the set of 8.
Installation took about 2.5 hours going very slowly, I wanted to be methodical and I was also just taking my time to enjoy the job. To do it again I could probably crank through it in an hour. I replaced all the plugs first and then disconnected all of the wires from the coil packs. I then found exact matches for the new wires using the old wires so I would have no issues with length. I numbered each of the new wires with a sharpie and used a diagram of the coil pack sequence to connect the new wires.
I also disconnected the battery while working on the coil packs just in case, I had no idea if I could be shocked or not so better safe. An added bonus to disconnecting the battery is that it cleared the soft codes and the SES light went out. So far I have two key sequences and about three miles with no SES light. The engine sounds great, back to normal with no sign of misfire.
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Good luck