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.. H&R 13-16 Mercedes-Benz GL350/GL450/GL550/GL63 AMG X166 ETS (w/Air Susp.). Easy plug and play install. No cutting, no splicing. 100% reversible. For vehicles with factory Electronic Air Suspension. Maintains factory ride quality and adjustability. H&R Springs Electronic Lowering System. Air Suspension Control Module. Electronic Lowering System. 100% made in Germany. Mercedes ETS. ETS

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