| Brian, I went through this similiar problem not too long ago. I ended up have a cracked head. But before we jump overboard with a cracked head just curious to how much boost you run and what octance of gas? Is your radiator coolant level low, or lower than normal?
Does your coolant have any oil contamination?
Does you oil have any coolant contamination?
What does your spark plugs look like? If all of the above are ok I wouldn't suspect a head gasket issue. I found my issue by using the coolant system pressure tester as Stanky recommends. At first I would just start testing before removing the coil packs as a head gasket can cause leakage from one area to any other area. Side note: My first experience with low compression numbers was a suspected head gasket (its hard to tell once you seperate the head from the block) and then I discovered broken piston ring glands. After the coolant system pressure test I would also recommend the leak down test. When doing this test remove the radiator cap and inspect for bubbles. But if you are not loosing coolant or your coolant is not contaminated not sure if this step is required. Good luck and we will review your shared results from your testing.
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