I went Cobb stage 2 within the first 5 days of owning my car. I bought it in June 2011 and I already have 22000 miles it. I hit 20psi at least 4 to 5 times a day. I beat on my car. My point is, the stock tune seems to be the problem. After your car is fix, get a tune. At least Cobb stage 1.