Dude if it's an 07 just get the krano aerokroil and follow the TSB yourself. You shouldn't have any problems if you're careful. I have an 06 with 11,000 miles when I pulled the plugs. Came out easy and we didn't even use any aerokroil.
If something happened there is a tool you can use that will get the broken off piece out of the head. Things have to go very, very wrong for that to not work.
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2006 GT, Manual
JLT2 w/91 Tune
FRPP 4.10, Steeda LCA
MAC Boomtubes
Goodyear 255/45/18, 285/40/18
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