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Old 06-17-2009, 11:00 PM   #58
Scooby Specialist
Member#: 32576
Join Date: Feb 2003
Location: Stevens, PA
04 STI


Newer Subaru manifolds have much larger runner DIA than almost all other stock manifolds, and thus will flow much more than comparable stock manifolds. They could use a little more plenum, larger TB, and flow balancing.
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