i just had my Invidia DP and my Megan Racing CBE installed and the shop charged me around 175 or something around that. Wasn't horribly bad. I was gonna install my self just never have time too and always busy with work or something else.
Make time its fun! And they shouldn't charge you more then 2 hours of labor... honestly 1 hour considering they will be using air tools and a lift... took me 2 hrs to do mine in my driveway... so i'd so no more then around $200 or so.... good price around $150
The bolt that is being reffered to is on the stock DP to the turbo.. its unthreaded from the factory.. Its just one but its enough to make you want to hit something with a 40lb sledge hammer.. Like I said I used a grinder and it came off in mins..
i offer this advice to the DIYer's,
i do all my own work on my vehicles. i have an extensive tool collection and i can "turn a wrench" if you know what i mean. having said that.... if you don't have the gear, knowledge, experience, place and tools... get a professional to do it for you. if someone can honestly not jack up a car and put it on stands safely, get someone else do it for you. the $150 labor is WAY better than having a car fall on you, getting metal in your eye or just F'n up things royally.