The Coupe Quattro is a very different car vs the 4000 Q. Extensive mods in the area of plumbing, fuel, cooling, brakes, steering and oil would be needed. Also, a different computer and wiring harness. These wiring \ harnesses are complex! Difficult and expensive, but possible. It's not as simple as "dropping" a turbo engine in, or you would see a lot more of these mods on the road! -glen