They say for every 100 lbs = roughly -.01 for your ET at the end of the 1/4 mile. A rule of thumb of course but the NISMO ways about 70lbs more than a base with sport pkg. I think that extra 70lbs might even it out in straights. Plus there have already been exhausts dyno proven to put about an extra 18hp to the fly wheel anyway. I think that a non NISMO will see a much better gain from lets say the FI cat back vs a NISMO Z. Reason is because if the NISMO's exhaust is designed to allow the gases to exit faster than its alreayd doing part of the job that a true dual exhaust will achieve. The tune I don't know much about but I would imagine they basically leaned it out and the 400 extra rpms is done with an ECU respec anyway and more. In the end, if you modded BOTH cars with the same parts and tuned both cars, I think the power would be nearly identicle. I don't know of any members who own NISMO's and have modded their car beyond the almost normal intake and cat back, but I bet you the NISMO won't see as big of a gain since both engines are the same, except one is already tweaked. If I were going to buy a NISMO, it wouldn't be because of the extra 18hp, it would be because of everything that comes with it, including the name.
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