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Old 04-30-2013, 06:52 PM   #16
A-man07
Scooby Specialist
 
Member#: 271525
Join Date: Jan 2011
Location: BagEnd
Vehicle:
07 STi
424whp/382wtq GT3076

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Quote:
Originally Posted by Maxwell Power View Post
I just measured the ID of the primaries: 1.50 at the flange, but the pipe is really about 1.52" ID with an OD of about 1.7
Okay, so really same as exhaust port diameter. Thanks for the data.
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