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#451 of 547 GNX's ever built. Each GNX was identical including the Black paint and Grey interior. This was a Buick Grand National on Steroids. The GNX option was an additional $11,000 on top of the Grand National MSRP. GNX's were modified by ASC McLaren in a deal with Buick. The list of modifications on a GNX is mind boggling! Read more ยป