The biggest difference in exhaust that would require tuning is for headers, crossovers (X and H pipes) and high-flow cats. These have a more dramatic effect on backpressure and subsequently can affect air fuel ratio.
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Bill Cohron - The Mad Doctor  
Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997!
(678) 890-1110
www.gopowerhungry.com - Home of the Hydra Chip, Minotaur Tuning Software, and the new Orion Reflash System for Navistar!
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