Chip?
GIAC and APR are considered by most people to be the best choices for chipping a B5 A4. from what I've heard and read, the GIAC tune has more "grunt" in the lower rpm range, and the APR has more top-end power. I think what it comes down to is which one is easier to get. which dealer is closer, and which one will give you a better price/service also comes into play in the choice.
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