2016 Nismo HP gain.
 

Considering they were both installed at the same time there is no way of knowing for sure. But it's not going to be one or the other. The cats can't be that restrictive to where it's the only choke point of the entire exhaust system. With that being said I'm sure the cat back picked up some power as well. If you're going to drop the loot on a cat back. Another 500 for test pipes is well worth it. The exhaust did not have resonators but the test pipes did and the car still wasn't loud. Perfect in my opinion. So if you were looking for power upgrades. I would top off the cat back with test pipes.




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2016 Nismo HP gain.
 

Double post

is picking up the stillen g3 still worth it for 2015-2016 nismo models?

Would love to know the answer to this also.

I bought my FI CBE exhaust due to the glorious sound improvement. Stock suxs.

Depends on what your expectations are. Unless I am mistaken, the current nismo body style is basically the same car mechanically as it was when introduced in 2009.

With that in mind, if it was a good thing before, it should be a good thing now. I have this CAI on mine and would do it again.