Hi guys, I have a 2004 Audi A4 B6 that I bought a couple months back from a buddy. When I purchased this car it was in pieces and had just gotten done over heating so I rebuilt the top end and re-timed the engine. I am satisfied with the way the vehicle is running, but there are a couple issues. My biggest concern is the GLOWING RED EXHAUST MANIFOLD. I do have a code reader and these are the codes I am pulling: P0420 (Catalyst System Efficiency Below Threshold Bank 1) P0299 (Turbo Charger Under-boost Condition), and lastly P0322 (Ignition/Distribution Engine Speed Input Circuit No Signal) I also found it weird that unplugging the MAS Sensor had no effect on the vehicle's performance. Do you guys have any ideas on what can be causing this red hot exhaust manifold? I do not want to drive the car to much in this condition to obviously avoid any further damage.
Thank you for you time, Joshua Cortigiano.