what is it? is the sport line the same thing as the sports package, what comprises the sport line/pakage... what is the advantage and or disadvantage of having it... or not?

S-line package on a A-class adds some performance options, but does not get as extreme as the S-class vehicles.
My A6 Sline has stiffer suspension and bigger brakes, probably other stuff as well.
I have only seen the A6 S-line in 2.7T, never a 4.2 model.

aren't the wheels different too and also sport seats

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1999 Audi A6 2.8Q
1995 BMW ///M3 Cosmos Black/ Black

The seats are the same, at least in mine.

My S-Line came with the RS6 wheels and spoiler, but I don't know how much of that was done by the previous owner and how much came stock.

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2004 A6 2.7T S-Line Edition

Based on my reading of the Audi Model Guide (Click here to go to it), the differences are as follows:

In 2002, you could order an A6 with a "sport" package. It added higher performance wheels, sport seats, and a more agressive suspension (lowered by 2 cm, 30% stiffer springs, 40% increased damping on the shocks).

In 2003, the sport suspension became standard. As such, the sport seats and wheels became separate options (no longer part of a package).

In 2004, the only 2.7T offered was the S-Line. It has a horsepower boosted version of the 2.7T (265 HP instead of the usual 250 HP), more agressive wheels, a spoiler, special badging, and -- surprisingly -- NOT the sport seats (too bad -- they're a favorite part of my 2001 2.7T sport package).

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My Registry Page

Actually, there WAS a regular version of the 2.7T in 2004 without the S-line package. Not all 2.7Ts in 2004 were S-lines.

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2002 A6 4.2 Silver/Ebony, Tip, Premium, LOTS of mods!

I stand corrected! (Boston Driver has probably forgotten more about A6es than I know.) Weird though -- the Audi product guide only listed the S-Line 2.7t for 2004.

So does this basically mean that the S-Line is a standard, 2004 2.7t + a spoiler + speical wheels + 15 HP (or was that on ALL 2.7s that year?) + special badging + NO sport seats? Did they offer a sport package for the standard 2.7 or was this THE sport upgrade?

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My Registry Page

S-line package added the spoiler, the badging on the grille and rear doors, the 15 extra ponies under the hood, and the 18" Ultrasport wheels (9-spoke RS4 style) wtih summer rubber. Sport seats, 17" S-line wheels with all season tires, sunshades, cold weather package, etc. etc. etc. were all optional.

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2002 A6 4.2 Silver/Ebony, Tip, Premium, LOTS of mods!

And ^^ THAT ^^ is information you can take to the bank (which, incidently, is where BD works!)

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My Registry Page

thanks everyone...this really helps...