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Dec15-11, 11:03 PM
P: 1

This is assuming shorties w/cats, '04 F-150 5.3--

Is the scavenging effect nil after the collector? Does sizing down the exhaust pipe(cooling gases contracting) help scavenge in any significant way, or is it just less detrimental than having a too large pipe?

Any value to header wrapping the exhaust pipe a certain distance after the headers to keep exhaust gases hot?