when i did the plugs, bosch single platinum, i torqued them to 32lbs i think (whatever you guys said on here) and it was a freshly calibrated wrench from autozone, and then a week later i retorqued them. the stock plugs had ~45k on them, and these have ~5k on them. i talked to a mechanic shop today in corona, CA, called Bob's Auto, and he said he can put in a new "sleve" with a reemer kit that taps right into the stock head, without removing the head, for a TOTAL of $300.00, and i will never have to worry about the plug again. he was telling me that this is a kit the dealer doesnt want anyone to kno about, and he has done it on many ford trucks and mustangs. should i try this and if it doesnt work then go aftermarket??? thanks for all the help so far...stangnet FTW!!