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Stage 1 is for mostly stock car and pump gas. There is 91 and 93 tunes
Stage 2 is for catless full exhaust and also pump gas. Also 91 and 93 tunes
E85 is for ethanol e85 with full exhaust no cats.
You do not want to run e85 fuel with a pump gas stage 1 or 2 tune or the other way around.
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