I have also been considering a larger MAF because it looks to be the most restrictive component in our stock intake/exhaust setup. But do you need to reburn the computer chip to properly calibrate the A/F ratio for the larger sensor? I have never been able to get a good answer.
You do not have to reprogram the computer at all...it should adjust itself after a few cycles.
I have heard several people say that you actually lose HP when switching out the stock MAF setup...this is why I haven't bothered...I felt a huge diff with just the densecharger and thats good enough for me...especially since the pulleys and the timing adjuster are much better gains for relatively little money.
You should really take your car to the dyno and test it with and without the Pro-M to see what it is actually doing to your A/F ratio. Without that, there is no way to really know. The Pro-M and C&L meters are good but they only have so much flexibility to alter your A/F map as the corrections they make are fixed for the entire load range. With a tuner like the one I just put on my car, you can adjust the A/F map with fine precision to achieve maximum power at WOT while maintaining your car's drivability at low load values.
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