2004 Infiniti M45
In days of yore the Infiniti M45 would be called a sleeper with a 340 horsepower V8 shoehorned into a non-aggressive sedan without any hint of its potential. Unfortunately, Infiniti got the concept right but forgot what every hot rod builder knows, weight kills. They saddled this sophisticated looking sedan with nearly 4000 pounds of bulk killing what might have been a sub 5 second to 60 car for one that is significantly slower.