you may have a vacuum leak check your vacuum lines. listen for hissing noises
Either the vacuum lines are factory fitted or in some places of this Earth then Local Police will seize the vehicle
A Chilton's Automotive Repair manual will have a diagram for the vacuum lines for the 1988 Supra Turbo. This is an inexpensive manual when compared to the labor costs. It is about $25 at most automotive parts stores.
You can find complete diagrams at http://www.CarGurus.com
No , not for a Mustang GT which has a V8 engine There were four cylinder Mustang engines that had a turbo version available
hellion single turbo kit for an 05 mustang gt cost $4,745 at americanmuscle.com
Not from the factory
It is very possible that the Audi has a vacuum leak. Check all of the vacuum lines for any leaks or cracks.
If a Carina Turbo will turn over but will not idle there can be an air leak. The vacuum lines should be checked to see if there are any holes.