 | | To give the Buick Grand National an end-of-production send-off, GM planned a production run of 500 “super Grand Nationals” ultimately named the Buick GNX. When demand for the GNX far outstripped supply, constructor ASC/McLaren agreed to build 47 more, upping the total production run to 547 units. The GNX received a Garrett T-3 turbocharger with a ceramic impeller; a ceramic-coated inlet pipe; an intercooler with more fins per row; a larger diameter dual exhaust; and a recalibrated ECU that permitted 15 PSI of boost. |
| The only colour was black. The transmission was strengthened, fender vents were added to further reduce under-hood temps, and the suspension was beefed up. Turbocharged 3.8L engine. Automatic transmission. Black with Black and Gray interior. This car changed hands at Mecums for $50k. |  | |
 | The 3.8L engine output was 276 hp and 360 pound-feet of torque. The GNX was capable of sprinting from 0-60 MPH in under five seconds, getting through the quarter-mile in 13.4 seconds.
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The Grand National sold for $18,295, while the sticker on the GNX was $29,290. In 2015, GNX 385 crossed the auction block in Palm Beach, where the 362-mile example sold for $165,000. In January 2017 the last Buick GNX, with 68 miles, sold for a hammer price of $220,000.
