Just thought I'd point out that GM uses these Monsoon systems, most notably the 2003 Buick Regal has them available and they are almost forced onto you by the dealers in the 03 Regal.
Off-topic: GM also used the same head gaskets on the 1998 Chev Lumina as VW did on the 1998 Passat. That was a lovely repair bill for the Lumina (oh, it's got a VW head gasket, only GM parts are covered by the warranty)
