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every application is a little differant, impossible to answer really.
shorty headers can sometimes increase top end HP with some sacrafice in low end. full length can have the oppisite effect.
On my 454 I switched from full length to shortys, & frankley, I cant tell the differance in performance.
 

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For most of the street vehicle (and strip for that matter) that I have worked on/with, we tend to go with full length whenever they will fit.
 
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