Caliper would be your friend here

 

75% sure its m10 x 1.5

 

thanks for your input 4.6, thats about where i am... i was set on the m10x1.5 until i saw someone else say it was m8x1.25.

Still waiting for someone thats 100% positive...

---------- Post added at 06:27 PM ---------- Previous post was at 06:25 PM ----------

This is the thread that i saw which gave me the m10x1.5.
http://www.modularfords.com/threads/61846-2003-Mustang-Gt-exhaust-studs

I want to say i trust this guy more then the other, so looks like i'll be trying out the m10x1.5.

If anyone else can chime in and lead me in the right direction that would be great.

 

bump

 

Call ford or look on fordparts.com

 

Are you able to get yourrs out? Do they thread out?I'm in the same boat I'd rather try and replace em than buy a while new manifold lol

 

i have 4 brand new ones and just go to autozone in the exhaust part area they'll be there
exhaust stud m10x1.xx dont remember that last 2 numbers

 

I was able to dye (re thread) them and tap the nuts (lol), the size is in fact M10 X 1.50. And yes they thread out. But you have to heat the manifold up with a torch and use PB blaster to remove them. Be careful not to break them off in the manifold...then you'd be fu**ed.

 

or you can get 2 nuts 1 bigger then the other, thread it up bigger one first. not all the way, then the smaller one and snug it and just unbolt the bigger one, it will pull the stud out

 

I think I'm just goin to make a flange around the original flange until I can replace the manifold so it atleast seals and stops popping and slamming against my floor board ever bump I hit