I really want to run the ethanol sensor and have the PCM control fueling based on composition.
I see posts here and there about people running hacked tunes to get this done and I am specifically referring to using a COS (I am boosted). OS for the 2002 Tahoe L59.
Only other options are to repin to an 03+ pcm
or
HPtuners.
And I don't want to do either of those.