I believe the HKS is a full 2.5" design through and through. I'm not entirely sure on the "stock" Nismo exhaust that comes on Nismo cars. I wanna say I recall that even the Nismo cars "stock" exhaust has pinch points for clearance? Leading to some points in the exhaust being under 2.5", which the car is tuned for. So if you put a full 2.5" exhaust on a car that isn't tuned for it, NA at least, there's a possibility that power could be lost because tune optimization? Spit balling here, not preaching facts, just thinking out loud.
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