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Bilstein B14 (PSS) Suspension Kit for 1998-2004 Audi A6 Quattro helper-springs 2005 Subaru WRX STI BaseBilstein B14 (PSS) Suspension Kit for the 1998 2004 Audi A6 Quattro feature ride height adjustability in an OE quality, direct fit package. These kits offer monotube performance Dampers with matched springs that are tuned for each specific application. The zinc coated and threaded body design will give you the flexibility to find the perfect ride height setting for your intended use while providing unsurpassed protection against the harshest road