This thread has grown quite a bit so post #1 will be used as an executive summary + nav. The initial vac line + check valve content starts in post #2.
Thread Navigation
Installation of Major Vac System Parts
2002 Details + Part Numbers for Vac + Vent System
Boost Leak Test
Emissions Readiness Test
Throttle Body Alignment/Reset
Vag Com Setup + Info (Mac)
Combi Valve <-> N112 Fix + 16795 Code
Crankcase Breather Hose Info
DV Diverter Valve Swap + Info
Mitsubishi Evo DV Diverter Valve Install + Relocation
Gasket Swaps: Valve Cover + Cam Chain Tensioner
Motor Mount Install
Oxygen O2 Sensor Swap
N249 + N112 Explained + Vac Line Routes
N75 Explained
Stereo Wiring + Ground Wire Mount
Intake Manifold Removed Pics
PRV / Pressure Regulator Valve aka The Puck or Pancake Valve
MAF Mass Airflow Sensor Cleaning
2.0T/FSI Coil Pack Conversion
Injector O-Ring Replacement + Cleanup
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