I called Wicked a few weeks ago, and they said about $400 in labor. The dealer I'm closer to in Natick MA quoted me almost twice that. I'm looking at replacing mine (read: having mine replaced) this summer.
Also, I would second others' praise of Wicked. They are worth the drive. My tune from them should have been a no brainer the moment I got my '07, but I didn't find out about them for a few months.