xdv8

what are the difference in intake manifolds between the auxr8's ?
according to the parts catalogue the auI lower is the same as the auII
& the III is different again (because there modified gt40p heads) but
all three have different numbers for the plenum section (upper). what is the difference?

EDXR8

I am not sure about the difference between the au1 and au2 uppers, there wan't any major differences done though, maybe it was just becasue the au1's had a "5L V8" little plate on the upper where the series 2 had the larger BBQ type plate which covered most of the engine. The auIII had the inlet port opened from 65mm to just over 70mm to match the 70mm throttle body used. The lower on the au3 was also port matched to the heads.