So what is it with GM/Chevrolet, not puting a different engine in the RS? According to info I got all they're doing is tweeking the trans. ratio to upgrade the powertrain. I initally wondered why they didn turbo-charge the 1.8 for the LTZ or new RS, but now Buick has a turbocharged 2.0 for their Cruze platform. Why if the engine is already developed doesn't Chevrolet put it into the Sonic RS? It would really improve the platform if you're looking for performance.