Stock exhaust pipe diameter

I do have a 2011, but I installed a 2007 fx35 y back on my car. You can check out my thread in 09+ section. Sorry, should of been more clear.
 
Hey Guys,

So the exhaust flange at the rear of my 05 fx35 rotted off. I used a flange kit with a 2.5 inch diameter to fix it. With the flange all the way closed it only stops at the flare on the flange not on the pip at the muffler. My question is what is the correct size of the stock exhaust? I also did an external measurement and coming up with 2.4 on the external using a string at 7.5 inches and dividing by 3.14.

I am a little confused and considering using a couple and clamps instead to do the repair but I need to know what size. Does anyone know the exact size ?
 
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