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Message: [QUOTE="Jeremysmith9902, post: 732416, member: 7117"] the main objective of porting is to eliminate air flow restriction.. now to what degree of porting you go to is got to corrolate to the aplication... if some one isnt porting the intake ports of the heads and doing a cam and all that stuff then a Diesel Doctor manifold is fine.. it gets the main obstructions out of the way and increases air flow as well at lower egts.. perpose served.. and for more serious applications yes the z-max and a few other manifolds would be more suitable. but for a dd this one is great for a person on a tight budget and just because it doesnt cost 1300 and have a RACE teams name on it doesnt mean its not a ported manifold... [/QUOTE]

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