RE: 2005-2007 Mustang GT 3V Coil Packs & Coil-on-Plug Connectors
The repacement coils are ONLY beneficial if you have forced induction and you are having problems with blowout due to high boost. On an N/A motor or FI with low boost they are useless.
Like Zkiller said, the GMS coils are not very good quality, and you always have to worry about them burning out.
Another option is the MSD coils. They are now available for the 4.6 COP. However, they are a very new product so I don't know any real-world feedback on them yet, but I would imagine they work like the GMS coils (only useful on FI), only I would expect them to last a lot longer.
Ozan, I realize this isn't what you asked about, but what stands out the most on your mod list is that you need a set of longtube headers to let those cams work to their highest potential. If you are looking for a mod to do, either longtubes or a 1-pc lightweight driveshaft is would be an excellent choice for your car.
Black 2006 GT Coupe
Dynatech LT headers & X; Borla catback
C&L CAI; 93 oct tune
Full BMR, Spohn & Steeda suspension
D-Specs; Alum driveshaft
Second Skin Audio damping; Infinity spkrs;
Goodyear Eagle F1 255F/295R - FR500 wheels