H&R 05-09 Audi A8/A8 L/A8 Quattro (2WD/AWD) ETS (w/Air Susp.) - 29244-3

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.
Installation Instructions