I just now went through the same thing. I have matco tools, and with their 10mm allen and 6' of breaker bar (from my big jack) i walked the hex. Dammit! So i bought a forney 7/16" drill bit and drilled the exhaust cam sprocket bolts right out, easy as pie. I suspect the remaining bolt threads will come right out w/o the pressure of the gears. Now here is my question; its an '04 STi EJ257 and has avcs, the top (intake) sprocket bolts have holes in the center. Whats that for? Im afraid if i drill them out i wont be able to find "holy" bolts to replace them. Suppose i can order them, but what are the holes for?