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This sounds like the other list with guys supercharging their S4's and writing how they "took on Vipers" etc. etc.
The car is now a 33 year old design. Aerodynamically, chassis dynamics, etc. If you want more performance.. why not save and buy a car that starts with the benefits of 30 years of R+D?
Add a cam, free flow exhaust, renew the suspension...
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