WARNING: This page is about a different car, the 2012 Audi S5, 2011 Audi S5, 2010 Audi S5, 2009 Audi S5, and 2008 Audi S5. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Intake Manifold Bolts Tightening Sequence
Courtesy of AUDI OF AMERICA, LLC
-- Tighten intake manifold bolts in -1 through 10- sequence.
First tightening: 8 Nm
Second tightening: 9 Nm and tighten another 90 degrees.