I paid $220 locally with a well known ex-BMW mechanic who runs his own indy shop out of his custom garage at his home.
mkPOTO is spot on, I'd assume most places would charge ~4 hours for this.
This was the first mod I have ever paid to have installed. Unless you have a lift, I would hesitate to brave this in your driveway. I have been modding cars for 10+ years dating back to my DSM and replacing the motor with friends, etc. and I would not want to deal with the N54 DP headache. I had to go poke around down there to try and find the source of a rattle and it's stupid cramped. Maybe I'm just old and impatient now. Watch this video from AR:
Not saying it can't be done, but is saving ~$220 worth it? At this stage in my life, h3ll no.