Sure Pepsi Strong Shot has extra caffeine, that goes without saying when you include "strong" in your product name. It's the extra carbonation, however, that puts extra gas in Pepsi's tank... not to mention yours.
More CO2 may be bad for the environment but that's not Pepsi's concern. They're more worried about Pepsi Strong Shot's formidable fizz doing a number on your face. See that yellow "caution" band at the top of the can? That's Pepsi imploring your thirsty bod to "wait 15 seconds" before opening the can, in order to calm the bubbly elixir contained within. If the suspense (or your thirst) is just too much, well, don't say you haven't been warned.