In conversations with a guy who knows mucho more than I do about Zs (he owns, wrenches, races and tunes them), he said the biggest bottleneck with a nismo exhaust is the OEM catalytic convertors.
Good to go with some aftermarket high flow cats such as Berk or other to open things up.
Needless to say (?) replacing the OEM intake with something more free flowing such as a Stillen Gen3 would be a good compliment to this mod.
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