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I made a discovery today about using the Emerald ECU and the Stage 2 Tune.

I have been using the S&S Stealth air cleaner, which is the AR Stage 1 cleaner. When I first installed it I noticed that it made a big positive performance difference in spite of having less filter area. I attributed that to the stinger inside it.

Since changing to the Emerald ECU with its Stage 2 Tune I noticed that besides the added power it seemed to be running more rich, rough idle, especially when cold. Giving more fuel to the engine was expected but the low end running slightly rough i did not expect. So I have been thinking what might be the effect of more air and I purchased the S&S “one inch taller” air filter kit for the Stealth kit.

It works! Runs very smooth and no coughing and pulls strong. Any of you with the Emerald ECU and a Stage 2 Tune I strongly recommend it the one in h taller filter.