H&R 05-11 Mercedes-Benz CLS550/CLS63 AMG W219 ETS (w/Air Susp./After 8/1/05)All H&R ETS modules are plug and play, with no wire cutting and splicing or mechanical wrenching necessary. This means that no modifications to your factory wire harness are required and the module looks like a factory installation. H&R ETS modules come with all the parts required for installation. The ETS unit is easily removed whenever you want to return your car back to factory specification. This Part Fits: Year Make Model Submodel 2007 2011