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Did you ever "chip" the car? Wondering about the difference in driveability.

APR tune for a 2007 RS4? Anyone done it and is it worth the $$$?

Hi Folks! I'm new to the forum and relative new to the car also. My question is about the difference and characteristics of this tune and whether or not is worth the $700 they want for it. 2007 RS4 (US)
Thanks,