Turns out General Motors' engineers didn't actually twiddle around with the 2011 Chevy Camaro's base 3.6-liter V6 engine, as initially thought.
Instead, the company claims that engineers were conservative with their ratings the first time and that after the presentation of the 305HP 2011 Mustang V6 the re-certification process found that the direct-injection V6 produces an extra 8HP and 5lb-ft of torque for a total of 312HP and 278 lb-ft of torque.