Hi Andy.
8s after 2002 have the 'Sport' mode.
On pre facelifts and some early 2000 facelifts it is located under the astray, and the later models it's just on top of the drivers footwell to the drivers door side.
Valve cover gaskets can go, defiantly a DIY job. They haven't gone on my current or previous S8 though.
Be aware of TPS, genuine Audi parts at trade prices.
Most Audi garages don't know the D2 very well, find yourself a good specialist.
Not any noticeable difference at all actually, de cat if and you may see some more power.
Drilled air box, first mod I'd do. Lets the V8 be heard but isn't too loud. 
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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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