Yep, probably so. I went to the Magnecor's at 50k miles.

Here's an OEM replacement set pretty cheap with a "make an offer"
shipping will most likely cost more than the wires

http://www.ebay.com/itm/Spark-Plug-I...3D272720357496

The Magnecor's are a bit more expensive :
http://www.ebay.com/itm/Magnecor-652...1YZeh7&vxp=mtr