Originally Posted by hack

If it's the stock stem, it's prob a -6/84 stem (as per Specialized's website). If you do get lower, you may get more aero, but may lose power due to the new position. Everyone says get a fit and you can do that or just tinker with percieved (or metered) power output relative to your position. You could get a -8, -10, or -17 stem and drop your front end a little bit to a little bit more, but not a ton. That'd come with a new bike.