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Old 06-18-2009, 08:02 AM   #61
Scooby Specialist
Member#: 32576
Join Date: Feb 2003
Location: Stevens, PA
04 STI


Originally Posted by unclemat View Post
Define newer.
All USDM WRX, STI, LGT, and 07RS manifolds. The "old" GC manifolds have much smaller runners (Pre TGV era).

I believe all these newer manifolds all have about 2.2"-2.25" ID runners IIRC. That is pretty large relative to what you see on other 4cyl.
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