For all of you that are thinking of changing atleast your mufflers, here is some interesting info I grabbed out of the latest Muscle Mustangs & Fast Fords, Sept. 05.

The tests were done by Anderson Ford Motorsport. They say the '05 is stock with the exception of a "modified airbox", no details were given about that mod though.
No big gains here, some even lost power. Just food for thought.
Jeff

 

Edit: I'm stupid.

 

Repost...