[iwasforcedtosignup]

Planning to replace the 2nd cat before the resonator with a vibrant resonator. (2015 S GT)

Does anyone know the internal diameter and length of the stock cat? I was thinking 2.5" internal w/ 18" or 12" length but wanted to be sure.

 

[gfpettus]

Curious about this too. I probably will be doing something similar soon.

 

[LiX]

Why don't you just measure it yourself? That's the way you will be absolutely sure.