2 Bar Maf installation
I search a few different ways, but nothing.
I have 12580698 Cobalt MAF and I saw something about shaving down a side of the MAF to make it fit a LS1.

Do you have a 2 bar OS? If not leave the 1 bar MAP sensor in there.
You just make it look like your stocker which involves clipping off a small plastic pieces and it'll fit like a glove.
Like Forcfed said, DO NOT install until you load a 2-bar operating system in the PCM. If you don't the car will run lean as a$$ and give some jacked up looking readings on the scanner. The 2-bar sensor is actually a baro sensor and the stock PCM program can't accurately use the values from it. Once you convert the PCM operating system to 2-bar SD it will work awsome
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