[blue2000s]

Originally Posted by Paul

From Motortrend:

The 2011 STI routes 305 horsepower from the same 2.5-liter flat-4 through a 6-speed manual transmission to all four wheels, meaning a blast to 60 mph will take 4.8 seconds, and the quarter mile in 13.5 seconds at 100.6 mph, as it did in our departed long-term STI. The robust Brembo braking system, which is good for a 109-foot 60-to-0 mph stopping distance, is unchanged

Read more: http://www.motortrend.com/auto_shows/new_york/2010/1003_2011_subaru_impreza_wrx_sti_sedan/index.html#ixzz1RIDQnKrB

The STi has had 305bhp from 2.5 liters since 2004. I haven't seen anything reporting that kind of power on the Boxster 4 cylinder.