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Old 11-06-2010, 06:45 PM   #8
Member#: 198281
Join Date: Dec 2008
Chapter/Region: MAIC
Location: Virginia
2005 WRX/STi
WRB of course


I have a few other comparisons, but in general with the longer primary type headers and 1.5 scroll headers (Invidia, GP Moto, etc.) you see significantly reduced spool time and power carried higher into the revs. With the shorter and smaller diameter primary type headers (Perrin, GTSpec, etc.) you'll see similar or better spool time with decent gains higher in the revs.

Here's a comparison to Perrin's headers (Killer B setup dashed lines)...

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