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They are not all the same. different cams with wrx - sti different manifold bolts centers for newer versions 99+ heads from the same year generally fit and if fitting v2 sti to a wrx, no gains unless mapped for the better cams and valves.
Not after gains. My 1994 wrx import has some gurgling out of the old coolant. I have a spare set of heads off a closed deck block just in case and need to know if these heads will fit on my block.
Not after gains. My 1994 wrx import has some gurgling out of the old coolant. I have a spare set of heads off a closed deck block just in case and need to know if these heads will fit on my block.