How to tell 2.7 and 5.2 manifolds apart?

It seems that 355 manifolds don't have the part number stamped on them. How do you tell them apart visually? Is it true that both are stamped on the heat shield with EM129L01 and EM129R01? (Left and right)

 

The size and angulation of the y-pipe connection are different. 2.7 is big and Y-s off, while 5.2 is smaller and more in line.

 

Can anyone tell from this picture if they are for a 2.7?
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2.7

Do you need new replacement?

 

I might, just trying to figure out how to tell them apart. Thanks Bruce for your help.

 

This is a 2.7.


Best Exhaust - Tubi Style Ferrari F355 2.7 95-99 Exhaust Manifolds 01059411070C

 

Here is a 5.2.


Best Exhaust - Tubi Style Ferrari F355 5.2 95-99 Exhaust Manifolds 01059791070C

 

Thanks Jim!