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Generally speaking installing most catless headers will decrease low RPM torque which is what gets the car moving & the headers increase power at high rpm. That's why I sold my headers & bought Fabspeed sport cat manifolds for my 3.6 litre.
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OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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