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You need a special header with gt40ps.I tryed a reguar long tube header on mine and didnt work out so good.I couldnt get the spark plugs in or out with the headers on and keep burning plug wires up to.Next time i will listen to evryone else
are your headers equal or unequal ? i have the frpp unequal length and was able to use them but i did have to run 90 degree plug boots with heat sheild boots on them .