HomeAll RepliesRe: Is the Buick Regal GS underpowered? Re: Is the Buick Regal GS underpowered? Sponsored April 5, 2012 at 1:05 pm #39540 Brian_EParticipant at about 150HP/liter, I’m pretty impressed – especially that trifecta tune fatherdeth mentioned. Imagine wringing that much power density out of the upcoming 2014 Vette motor. 5.5 liters @ 150hp/L = 825HP! Sponsored Subscribe to GM Authority For around-the-clock GM news coverage We'll send you one email per day with the latest GM news. It's totally free. First Name Last Name Email Address Subscribe via Email Leave this field empty if you're human: Sponsored