(http://media.il.edmunds-media.com/hennessey/hpe600/ns/hennessey_hpe600_actf34_ns_30811_196.jpg) Hennessey Performance Engineering offers a 602-horsepower upgrade for the 2011 Camaro SS Convertible, with prices starting at $56,495.
Source: Hennessey Launches 2011 HPE600 Supercharged Camaro Convertible (http://www.insideline.com:80/chevrolet/camaro/2011/hennessey-launches-2011-hpe600-supercharged-camaro-convertible.html)