Running really lean is not good for engine parts... I don't think you can fool the computer with timing or temperature and wind up with results consistent enough to run well or even avoid engine damage. The only way to really take advantage of the change in airflow IMHO would be to have a skilled tuner spend some dyno time to instrument a few different setups and burn a chip with a new fuel map... and even that would require a level of familiarity with Isuzu programming that may or may not exist in North America.

If you're dead set on trying this, look at the CSK or Pro-M MAF modificatons, but do it with a skeptical eye and an ability to do research, because both of these claim to be 'matched' to fuel injectors, which IMHO is a pretty good bend of the truth. The trick to this is staying within the 15-25% adaptability range of the stock computer's fuel map -- and IMHO, it is a real crap shoot in across the range of daily driving situations. It has to work on the dyno, at the track, **AND** on the street, for me...

Randii