What is the WORST part about an engine swap, whether that’s direct or an entirely new engine.

Is it the custom fabrication, the wiring, the aquiring all the necessary parts. What do you loathe the most in the process.

2020 WRX base model problem?

Cobb Accessport was showing my AF Learning 1 going to -15 down to -30 at times. I finally found out it was my MAF sensor. Got it replaced and now this is where the riddle starts. My AF Learning is between -6 and +6 which is normal. But not I am getting Feedback Knock and Fine Knock Learning anytime I go into boost.

Question is... Is the car re-learning because the MAF sensor is working correctly now? Or is that nothing to do with it?