Pontiac Grand Prix
With the restyling of the Grand Prix for the 1969 model year, Pontiac introduced a really special car. First, there was a cool-looking new design with a long hood. It had a short rear end and a very interesting and driver-oriented dashboard. The 1969 Grand Prix looked apart from the competitors, and sales immediately jumped. Second, there was a cool trim option called SJ. It featured a high-output 428 V8 engine that delivered 390 HP and many other performance options.
The moniker “SJ” was from the legendary Duesenberg brand. The SJ insignia was featured on the most potent Duesenberg cars back in the day. Pontiac wanted to get a piece of that legend with the Grand Prix SJ. The automotive press and the fans received this personal luxury car well, resulting in great sales numbers for the Grand Prix (via Hemmings).