P0101 MAF System Performance is the code I get. I did some research with my buddy a Isuzu master mechanic at the local Isuzu dealer. We looked up all the parameters on the MAF sensor. My MAF is supposed to register between 3 - 6 g/s flow rate at idle, which it does. From idle to shifting from 1st to 2nd it should register from 3 - 6 g/s at idle to as much as 100 or greater before making the shift from 1st to 2nd. Under full throttle, it should normally draw about 40g/s flow rate through the MAF. I took his Tech II tool home with me and monitored the flow rates on my drive up the canyon. Under full boost (6 PSI) and near redline my MAF is registering as much as 129 g/s of flow rate. The average flow rate going up the canyon at about 4 psi of boost is between 70 and 79 g/s. The ECU will trigger a code if it detects a flow rate greater then 40 g/s for a total of 50 percent of the last 200 samples monitored. A sample is taken every cylinder event. So in other words, going up the canyon with a flow rate of 70 - 79 g/s on average for a sustained amount of time will trigger the code. I spoke at great length with a guy named Mike at Split Second. After describing what the problems are, he feels very positive that he can program a frequency clamp to resolve the problems I am having. I am faxing him all the tech data on my MAF so any questions he may have will be in the tech sheets. He will set the clamp for a maximum frequency of 9000 Hz which is the upper limit of the MAF under full throttle. Hopefully it will work and the problem will finally be put to rest. I'll keep you posted. One other thing I just noticed is that you indicated your friend tried a Split Second voltage clamp. I don't know on the Axiiom, but on the Vehicross the signal sent back to the ECU is a frequency not a voltage. If your MAF is the same, you would need to have a frequency clamp not a voltage clamp.