a friend of mine has an 03 cobra and it just blew the number 5 spark plug out while he was driving yesterday. i wasnt with him when it happened so im not sure if he was getting on it or not when it happened. he called the dealership and they said they ve never heard of this on mustangs but have seen the problem on f 150s and 250s. he bought new plugs and now the new one he says wont thread in? any one hear of this? i thought i heard about a recall on those heads,not sure the reason for it but some what remember them having an issue.