Well modded Ur S4 valuation

[John Larson]

Help!  I have a friend who is in financial difficulties and needs to 
sell an S4.  This is no ordinary car and has had a TON of money thrown 
at it.  It was built by and for a skilled driver with a sound background 
in both HP and handling, as well as reasonably good taste for how a car 
should look.  It has gobs of horsepower and torque, handles like a go 
kart, and isn't for the faint of heart. It's scary fast.  I need some 
assistance in determining a value, or rather a starting price.  As her 
husband is currently unavailable to help with the sale, I've offered to 
help.  Right upfront, I realize (as does she) that we're in no way going 
to recover anything approaching the money spent on the mods.  With a 
network like ours, I think I can do this.  Any and all assistance would 
be sincerely appreciated, especially referrals to places where I might 
optimize both the exposure and the chances of selling it.

TIA, John