Well I was at a certified APR dealer two days ago and he is also a tuner for 2 other companies. He said by far, APR is the best product for the S4. They have incredible R&D for their products. And apparently GIAC ECU's, which i've seen recommended on this forum, overboost the S4 turbos and will lead to early failure. APR doesn't do anything stupid like this. Their much higher quality turbos as well. I plan this fall to sort of turn my 2000 S4 into an RS4 with brakes, suspension, tires and APR's stage III upgrade. 412 HP to the wheels! and 485 lb-ft of torque to the wheels!
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