Dean,
After having a lot of experience with the OEM compressor, I converted to
the Sanden configuration, first on the 455 and then on the 500. NO WAY I'd
even THINK about replacing an OEM compressor. Just the improved engine
access with the Sanden is worth the conversion, IMHO. And if the largest
Sanden (S15?) is used, it will definitely perform as well as the old A6.
JMHO,
Ken H.