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  1. Understanding how bolt on parts make a difference without a tune

    I'm a bit confused about the "bolt on" performance market and claims. couple questions that might help me understand. 1. "Yes or No" Isn't the main purpose of the ECU to keep you in the "Ideal" air to fuel ratio? 2. "Yes or No" on the stock Ecoboost is not the throttle body the most...





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