35 dollars a spark plug? Wowzers.

If you have 30 minutes, a 10mm socket, an extension and a plug socket you could do it yourself for the cost of the plugs, which is 5-6 for quad tipped iridium or whatever.

2 nuts hold down the engine cover
2 bolts hold down a coil, 1 snap on connector connects each coil to harness
6 plugs come out with the plug socket

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2001 E53 3.0 5pd