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Exactly there best " guess ". Which is why I wouldnt buy mail order. See now ur having to put it on hte dyno. Send the results back to them, and send ur rom. Wait for them to adjust it. Go back and put it on the dyno and see if its right. Then if its not do it all over again. Waste of time. It cost about the same money to take it to a tuner and have it dynotune for your specifice application. Then you KNOW its right AND get the most power you can out of it. You could get your rom back and the airfuel be right and the car run fine, but your not going to get as much power out of it as if you would if you took it and had it dynotuned.
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