I received a call-back from one of the local Ford dealers today, in regards to changing the spark plugs in my Mustang GT. I had previously changed them in my 2007 V6, but have heard horror stories about the GT plugs. The service advisor was very pleasant, and proceeded to quote me a price for changing the plugs. He said the base cost would be $650, and they charge one hour labor for each broken plugs. The hour labor translated into $125. That would mean an extra $1000 if all 8 plugs broke...

Spark plugs removal for 2006 Mustang GT.