Yellow: I think my shop replaced the studs with fully threaded pieces when they did the X pipe for that same reason. I also used a Ford Racing metal gasket on the car. Probably won't be long before it's all apart again anyway for the headers and my eventual Cobra R exhaust (Yes, an authentic Bassani 2000 Cobra R single muffler design 2000 R exhaust setup). I also used the German torque method on everything down there: GoodEnTight! If it happens, it happens....