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3b mid pipe is a y-type from 2 cats and 7A is a single one. 3B is 2x60mm -> 1x 65mm to middle box and 60mm back from middle box. (IIRC, it's been a while since measured)
Both cars have same pipe diameter to the back box and the boxes are interchangeable, but originally they are not the same.
Btw strangely part of the original exhaust is stainless and partially it's not.
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