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The parade of updated 2011 Ford Mustangs will march on at the Chicago auto show with the Shelby GT500 receiving a handful of revisions highlighted by a new aluminum block for the 5.4-liter engine. By switching from iron to aluminum, Ford engineers have shaved an impressive 102 pounds from the engine's weight. There's also an upsized intercooler that lowers intake temperatures and a new exhaust that delivers a heartier growl. Those two changes allow output to rise 10 hp to 550 hp while torque remains unchanged at 510 lb-ft. A six-speed manual is still the only transmission.inline_mediumwraptextright32275311/features/news/1002_2011_ford_shelby_gt5001002_01_z+2011_ford_shelby_gT500+front_three_quarter_view.jpgTrue