how much should i expect to pay to have someone install a full turbo kit including an intercooler in my car? how much should it cost to buy piece by piece instead of a kit (range like 1000-1500?) how long will a turboed d-series engine last driving daily at 7 psi (the engine has 73,000 miles now)? With a boost controller, does the boost change instantly at the press of a few buttons, or do i need to turn the car off and let the turbo cool or something? i have just a muffler, is a cat back exhaust totally necessary for a turbo application?