11th July 2010, 21:15
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#2
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Saxperience Forum Bum
Join Date: Dec 2009
Location: Uckfield, East Sussex
Posts: 3,362
Car(s): Citroen saxo 1.4 furio
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They give different pulse charateristics so will be better matched to the engine at different rpm ranges.
4-1's are generally suited to higher rpm
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