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To repeat what others said, I estimate up to .20" of buildup shouldn't cause any problems. If you look through the FAQ (picture is below) you can see that cars have driven with pinky sized air holes and still run, although with lowered power levels. Obviously such a restriction will increase pressure and lower power. http://www.myturbodiesel.com/1000q_how_to/a4/intake_maniremove.htm
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