What is the best performance chip for an Audi S4 B5/year 2000?

Q:

A: Performance chips are mostly based on subjectivity. Unless you really really want that extra 1% increase, you can choose from GIAC and APR. I would go for GIAC only because there are two settings on the chip that will allow you to go back to your original software in case you need to pass your smog test and can't.

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