What size extension, and socket do i need to get the plugs out?

 

Standard 5/8 inch spark plug socket. Even though the rest of the car is metric, the hex on spark plugs is still made to inch standards. I think a 6 inch extension will reach the top of the hole but a 12 inch extension makes it easier.

You will want to have a pair of needle-nose pliers handy because after installing a plug, often the socket stays on the spark plug while the extension pulls out of the socket. Then you need to reach in with pliers and pull the socket out.