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It was a very challenging task to take one of Audi's most accomplished cars, the S4, and improve its performance without compromising the essential "rightness" of the car. We consider our efforts a success.
In Part 3, Project S4 acquired a substantial power upgrade to its 2.7-liter turbocharged V6. APR stepped in with its Stage 2-plus setup, increasing boost from the stock 7 psi to an astonishing 1.0 bar--just over 14.5 psi. On my first test drive with the 100-oc
Pablo Mazlumian –
Nov 18, 2002
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