I think intake manifold would have only affected you in low rpm's in first gear in drag race as changing into other gears rpm's would be high enough for intake manifold to be in stage 3 as it probably was all the time if it was not working properly. Of course I can be wrong as I only have 32V and not 40V so it could be different.
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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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