HA, no, i guess you dont know how a turbo works in a diesel then!
Turbos work by not only taking a fast moving exhaust pressure to spin the impeller, the fuel that is not completely burnt up and is still burning as it escapes the head of the engine gets compressed by the housing as its forced in by the exhaust pressure. this causes a further burn of the fuel and creates more power. dont believe me, maybe you should read up on why turbos are places as close to the head as possible with the least amount of tubular distance. Maybe watch some videos on high powered engines, ever see the glowing exhaust manifolds? Here is a great visual of what im talking about.
2:50 to 3:00+ you can CLEARLY see flames shoot out of the turbo, its supposed to do that.
https://www.youtube.com/watch?v=V4jPC5a3YW8
there are plenty of threads about turbos that are placed in the rear of the car as there is no space, in fact there was a thread, cant remember who, has his or has his vr6 up for sale mk3 for 10,000 its a full awesome build with the turbo placed under the seat. you still get decent performance from them this way but thats a gas engine where it does not count as much and only running 7 psi.
you clearly are mistaken