Typically I can boost up to 17-18psi no problem on a regular basis.

Coilpacks were never replaced, but I doubt it will be needed on an AEB, or 98.5 car.

Ignition Module has been replaced, as it was causing misfires in the spring.

Knock sensor, is a possibility as it causes misfires on S4's

Injector, well that is unlikely.

I moved the CP around and it always comes back to misfire on Cylinder #2.

Please give me a hand with this...

TIA.

The gap can open up over time which would cause misfires at high boost.