Correct, just the charge pipes... the pro-tune found that power...I noticed this as well. You jumped from 245 to 280 and it appears all that was done is a charge pipe upgrade. Was that the same dyno different day or two completely different dyno's and a pro tune? Can you comment on your AFR before and after the pro tune at that stage?
I'm sorry, I can't explain the variations of the AFR before and after... guessing the tuner was able "fine" tune this... I leave that stuff up to the professionals.