Originally Posted by BCobaltSS

I live in MI and the gas stations switch over to winter gas around now(which is crap) . The GMS3 ECU leans out the mixture and is great for the summer but with the extreme dense cold air that is rushed into the intake and the degree of knock that the lack of octane there is in the winter gas. I switch back to the stock ECU for the winter time that has the GMS2 tune on it that was tested for normal drving all seasons instead of one for off road applications

Originally Posted by rockkrawler628

yes, I knew that. but that doesn't answer my question.
My question is does it pass emissions when i take it in for emissions and inspection? I don't need to know about inspection just emissions..
Oh yeah... And don't shout at me roel... its not nice.

Originally Posted by Staged07SS

1. whats the a/f ratio of the GM Stage 3 Tune? i have logged my 07' GM Stage Tune, and the a/f ratio is 10.80..

Originally Posted by Pyros777

Just re-read this and noticed this went unanswered. Its 11.3 from 5500 and up.