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Old 04-30-2013, 06:12 AM   #12
A-man07
Scooby Specialist
 
Member#: 271525
Join Date: Jan 2011
Location: BagEnd
Vehicle:
07 STi
424whp/382wtq GT3076

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Hi Dom thanks for replying. Wouldn't the large diameter primaries be slowing the exhaust gas flow and unecessarily slowing spool without adding significant top end flow? For example the Killer B header uses stock diameter (1.5") primaries and as far as I can tell doesn't seem to be top end limited.
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