Air box work is designed to work as intake silencer so the effect is similar to that if you drilled holes in exhaust silencer but to lesser extent. Fitting the pipe over them would diminish effects.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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