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


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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