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Old 01-31-2008, 08:28 PM   #2
Scooby Newbie
Member#: 166887
Join Date: Dec 2007
Location: Philly
1995 Impreza L


i was running my last project car on an open header (straight 6) and as soon as i put a exhaust on the thing really woke up.. theres science behind it. having an properly tuned exhaust aids in cylinder filling, by effectively removing exhaust gases before IVO and during overlap.
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