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I just finished changing mine. They are in the center line of the engine, under a plastic air box on top of the engine. Looking from the front, you loosen the hose clamps on the rubber tubes, both left and right, work off the left one, and take out two 10 mm head bolts that attach the air box. Pull off the vacuum connector on the right front of the air box, lift the front a bit to clear the breather tube under the front, and lift up and off to the left working off the right rubber connecting tube that goes to the throttle body. The plugs each have an igniter that has to be loosened and removed, gently, and then you can get to the plugs. Took me an hour with a standard set of sockets.
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