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has anyone ported and polished the intake on a 99 altima, and if so what were the gains??
 

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intake manifolds are port matched...and then take it to another step and extrude hone .....the process makes the runners smoother for air ...gains all depends on your mods as well ...good luck
 

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Also do a search, it was discussed in more-length anyway-in the Tech forum a few months ago. There's a company that will do custom manifolds but it's high and Extrude H charges either $385 or $550, can't remember which cause I got prices for the intake and for a head job last year but like GOKU said, unless you have pretty much every other bolt on, the difference will be negligible at best most likely.
 
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