.
>I'm not sure if it's useful info, but I belive the 4000 engine is the
>same as used in the the GTI/GLI; 1.8L, good for about 100 hp in the
>right state of tune and aftermarket parts are plentiful.
>
The 4000 has always borrowed from the VW bin up to the 2.0 liter, which Audi
got first.  The early 4000's used 1.7 VW motors, then 1.8's, then high
compression, knock sensor controlled 1.8's.  The same motors were used
progressively in the golf/jetta platform.  The 1.8 is a truly wonderful
motor due to its bottom end strength, longevity and excellent parts
availability.  My 1.8 turbo motor has powered my rabbit pickup to 14 second
quarter miles with zero failures. ~170 hp.
PSD.