It’s amazing how the muscle car wars – all but dead a decade ago – have reached pretty amazing heights. Both the Chevrolet Camaro and Ford Mustang get better each model year, with power boosts, chassis changes and visual tweaks bringing a steady flow of news and anticipation from the collective fan-base.FAST FACTS1. Replacing the old 250-hp 3.5L V6 for 2011 is a new 305-hp 3.6L unit.2. Base