A popular thread on many 8 forums! 
The following has ben done on D2 A/S 8s:
Twin Turbos by a guy in Brazil (I'll post pics when I get home)
Blower by MTM (HOW MUCH!  )
N2O Dry shot by a guy on Audiworld (lo BHP allowing ECU to compensate with enrichment)
Free Flo exhaust (either quad conversions or replace stock with baffleless boxes) gives a better pick up on acceleration. No one has yet produced a BHP or torque curve to confirm power increase.
Remap (Mkoneman has done this)
4.2 lump but in an RS 4 I know is running a 100BHP N2O rig. No problems in the 6 months since fitting.
If your N2O savvy then that is probably the cheapest way to go for the extra Gee Gees.
Mike
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Conan (the Librarian)
Watch it if you dare
Currently,
2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block.
1997 4.2 A8SQ - the Projekt. 12 years and ongoing!
1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard
2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion.
2005 C5 Allroad 2.5TDi FE - Grey - Workhorse.
2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter.
Previously
2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex
1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure.
1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex.
2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on.
1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8.
And a list of non VAG going back 40 years before I saw the light. 
Last edited by Conan_the_Librarian; 29th January 2009 at 05:15 PM.
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