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"To use the output from the larger blowers, Motorsport adds HKS' PFC - Program Fuel Computer. The PFC raises the factory fuel cut point from an indicated 7,200 rpm (which HKS found to be a true 6,500) and the rev limit. The PFC eliminates the stock speed governor, which limits top speed to 157 mph. HKS removes the air mass sensor from one cylinder bank, replaces it with a relocated single sensor feeding just the left bank of cylinders. The right side is wide open, with no air mass sensor restriction. HKS found that the factory airbox was just too restrictive to meet their ultimate goals, so a pair of Power Flow air filters complete the intake tract changes. Gartshore: "Just moving the air mass sensor and adding the free-flow filters adds an easy 35 horsepower." So not only are they still using the MAS sensor they are also running a piggy back ECU to double the output of whatever the MAS is reading. On top of that they specifically state that it's not only the moving of the MAS that makes the extra power it's the use of twin filters in place of the stock intake, I think you can figure out which one of those makes the extra power. Epic fail.
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