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The theory behind equal length headers is to ensure that exhaust pulses from multiple cylinders do not reach the collector at the same time causing spikes in the exhaust pressure. I also have a 5.0 Mustang for which equal length shorties are available. They look like spaghetti and are a PITA to work with. All dyno tests show they are good for a couple HP more but are not worth is compaired with the headach they cause working with them. They are no true equal lenght headers for our application.
 
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