Ranj - Sell the S4, and the A8. Buy a 4.2 TDI A8, map it. Job done.
It will be quicker, more economical and more comfortable then both and you can't use both at the same time. Or buy a facelift D2 S8, no point wasting time upgrading the old PF A8 for the gearbox to go 1000 miles later. You know it makes sense. 
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2009 Audi RS 6 Saloon V10 - 420mm Ceramics, Keyless, Soft Close, Adaptive Cruise, Glass Sunroof, Blinds, Twin Pane & UV, Freeview & DAB, High Beam Assist, MTM bits, Audi Exclusive Bits, MRC, Milltek, GYEF1 ASY2's, Bluetooth streaming music to AMI mod - 753 PS/1021 NM
2016 Audi S3 Saloon, Sepang, S-Tronic - B&O, Tech Pack etc... Company Car
1995 Audi A8 4.2 V8 quattro Sport - Bose, Solar, Blinds
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