My s8 six speed

[ewe1v]

hi all,
as you probably all know I am a newbie,
and just found the delights of AUDI,
I just got myself a 2000 s8
and boy she's fast. but I got it as a swop for my old van so don't know what she's worth..so it's a
2000 year
4.2 but was told its chipped to 400 bhp ??? don't know but wow she's quick
its a left hand drive
six speed (I believe this is not so common)
has solar panel roof
all the kit
is a kind of a very dark grey looks black,
just had the cam belt and pulleys w/pump and s/belt and the bearings on the viscous fan plus full service
anybody care to take a stab at a price for me?
thanks