RS is a model designation like LS, LT, LX or XLE. For Chevrolet, though, RS has some history and is more than alphabet soup. It began as an option package on the 1967 Camaro when it was officially called Rally Sport but was denoted with RS badges on the cars.
Chevrolet has used RS on several vehicles since for models or option packages that contain spoilers, side skirts, larger wheels and tires, and other features that create a sportier look and often include substantive performance enhancements.
Such is the case with the current Sonic RS, which has a unique grille, front and rear fascia and wheels, along with a lowered and stiffer suspension, performance transmission gearing and specific interior trim.
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