I've been trying to tune my MAF for the Hahn intake that came on my car because the guy who tuned apparently couldn't. I was getting around -30% STFT and LTFT pretty much all the time. I used the method that BYT and CSSOB posted but I think since most of my pids are reading in the negatives, it's not correctly adjusting them, if that sounds right. Honestly, i'm new at this and I'm not trying to make money from anyone, so I'd appreciate any heads up I can get. Plus, even with very mild or stock spark tables and cam tables, I've been getting KR all over the place. The guy that tuned my car (before I bought it) had the PE tables set up at .77!