The GTO guys say they do it because the MAF sensor heat soaks therefore the IAT reads warmer than what it really is. My guess is that it reads more accurately. But depending on if you are running a bit rich or a bit lean, a resistor would work for you.
When I was building my HHO cell, during my research, a lot of guys were running resistors in their upstream O2 sensor to do the same thing.
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93 GMC Typhoon: new money pit/PITA. Now GT3788R powered.
Boost, because sometimes atmospheric pressure just isn't enough.
"If it has tit's or tires, you can be pretty sure your going to have problems with them..."
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