14 More Great Sleeper Cars

Photo by elstro_88

7. 1987 Buick Regal Grand National Experimental

The Buick Regal Grand National Experimental (GNX) was hailed as Detroit’s last rear wheel drive hot rod. Buick partnered with McLaren Performance Technologies/ASC to crank up the power on the already beefy Grand National. The V6 engine under the hood produced 245 horsepower and 360 lb-ft of twist. The extra power came from a Garrett T-3 turbocharger and a large intercooler. The automatic transmission was reprogrammed to have more aggressive shifts, resulting in a zero to sixty time of 4.3 seconds. The blocky 2-door body made the GNX appear to be a standard Buick, but those in the know took one look at the GNX and knew better than to try and race it.