Attention: TDR Forum Junkies 
On the back of your stock turbo is a cast elbow. If you buy the turbo mount pacbrake it replaces that. You can also go inline, that's your choice. If you are staying with a stock, or single turbo the inline is a bit easier to install since you won't need to do any welding.
Look here for a pic:
PRXB Exhaust Brakes - PacBrake - Exhaust and Engine Brakes for Automotive, Motorhome, Medium Duty and Heavy Duty Vehicles
You then need to mount the compressor, small air tank, switch and run the appropriate wires. I would think an average mechanic could do it in 3-4 hours depending on how much of a hurry you were in.
I bet they would email you instructions if you wanted to see them.
