Hello nigel ,
The Audi/VW 5 Cly. have a redline above 6000 RPM.
The Power range start at approx 1600 RPM and goes untill
5000 RPM,with 5800 RPM you still have 75 % of the peak power.
With your Syncro you will be able to get approx. 100 Miles high speed
with a Audi  2.3 l engine with out reaching the RPM limit.
My Vanagon 2WD/4 speed with the 2.14 l engine and 103 hp  runs smoth
at 75 m/h and accelerat even on a hill easy beyond 85 m/h .
If you like to drive a 5Cyl. Audi give me a call 925 606 8797

Livermore ,CA  94550
near San Francisco

Sincerely Detlev

Vanagon Projekt