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There is a technical service Bulletin out on device compatibility.
Go to the Buick site, look at the Lacrosse features, wireless charging, there is a link in the description of the feature, click on it and a GM document will pop up.
The 2014 uses a one piece exhaust consisting of center pipe and two mufflers. Look at gmpartsdirect.com . The aftermarket may sell individual mufflers but have no way of knowing if they will fit your car.
The smell is from sulphur in the gasoline reacting with the catalytic converter. Who cleaned the injectors, a dealer or qualified shop? Hopefully they did not damage the catalytic converter. Try a fresh tank of gasoline and if it continues go back to whomever did the service.