1987 Buick Grand National. During the late 80s there were a few iterations of what GM made called the G Body including the Cutlass, the Monte Carlo, and the Regal. The Grand National was what you get when you take the Buick Regal, drop a V6 in it and add a turbo, making for one of the greatest sleeper cars made from the factory in car history. This Grand National has been taken above and beyond the call of being an unassuming performance machine by rebuilding the original 3.8 liter V6 to handle the boost coming from the much larger than stock turbo, which is pushing close to 18 psi of pressure through an intercooled setup featuring a larger wastegate and a Godzilla blowoff valve.