Does anybody know the size of the exhaust manifold/cat flange size? I'm trying to figure this out to see if a set of test pipes for the Z will fit my Frontier. I know they won't literally bolt in, but if the flanges are the same then I can work with it since I have a mig welder. They don't make test pipes for the frontier and I have been unable to find our unusual sized flanges. The 3 bolt flange has basically a 3" x 4" bolt pattern. From what I have seen, Z's have a fairly similar design.
Here are a couple photos of the flange--

 

2.25"
PM me if you need Z flanges.

 

Is their anybody who can verify this sizing?

 

See Post 2.

 

I tried him. He has Z flanges, but he cant verify the size either. I need to see of the Z flange and the Frontier flange are the same.