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Originally Posted by
Robchaos
The primary tubes are 1 5/8" with a 2" collector outlet.
Straight from s&s. I am asking them about making larger diameters for VE/built DE guys.
Hmmmm far to small to be any beneficial - i reckon the tubular JDM manifold might perform nearly as good. Sometimes the wrong combination can absolutely choke a motor.
The SSAC does have massive primaries, which would straight away give them a head start.
For the money its either SSAC or Freak headers - anything else inbetween isnt worth the money for the gain.