well i now that with hondas theres interchangable parts as far as performance and body parts, is there like a list on her that shows waht parts are compatable with my 01 a6 2.8l . it seems to me that the a6 and s6 have interchangablity for body parts like bumpers and mirrors and such am i correct?

 

The 1998 thru 2001 A6's are called pre-facelift.
In 2002 Audi restyled the front by slightly changing the hood, grill and headlight shape.One of the morenoticeabledifferences is the flush headlight washer on the 2002 thru 2004 models. Front end body parts such as hood, fenders, grill and even windshield are NOT interchangeable with an S6 or 4.2 (V8) even if the A6/S6 is the same year. The 4.2 V8 cars are "widebody" models with fatter wheel arches and wider lower side skirts.
Take a look at the pics in this thread https://www.audiforums.com/m_522702/tm.htm

 

so basically theres nothing interchangeable between all a6's or s6 or rs6 then except maybe spoiler