i was thinking of getting the 5 hr demo that revo offers. should i replace my dv's before i do this. i wanted to test it out but i have to wait until next month before ill have the cash to do the chip and the forge dv's. is it a requirement to change the dv's even with the demo? thanks

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01 a6 2.7t quattro tip, APR fully loaded ECU, window recode, valentine 1, k&n, clear corners, limo tint...more to come