Re: 1991 5.0 vs. 2000 Audi S4
For the most power possible go to www.cammotion.com and get a cam custom built for your mods. It will cost about $300.00 but it is well worth it.
For an off the shelf cam with your mods I would go with the B-cam with 1.7 roller rockers. The B-cam and GT-40 heads work great together.
A cam will really wake your car up from a roll. 
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92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim.
00' Lightning-Stock
88'CRX-13 second ego killer
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