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Old 03-18-2003, 11:07 AM   #7
johnriley
2nd Gear
 
Join Date: Jun 2002
Location: Kansas City, Mo
Age: 45
Posts: 211
A normal manifold has 4 runners one for each cylinder. The dual stage manifolds have 8 runners 2 per cylinder. At lowrpms only 4 of the 8 runners are open and at a certain rpm all 8 runners open and allows more airflow which equals more hp! Some people call this Pre vtec
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