When I was naturally aspirated I had the 80 mm from overkill and when compared to my highly ported stock unit it was pretty much a wash track tested you can see the track results finding my old post, however the 80 mm did provide a few more numbers in the upper rpm range in air flow.
I think if my stock throttle body was stock I think there would have been a measurable difference, but my stock unit was ported more than anything you could ever buy.
I'm buying one now to test with the supercharger to see if I can trick the programming to give me more power on launch, I don't get full throttle til 4900 rpm and if the programming goes by degrees/ percent of throttle opening I should be able to get a little more launch power.
I may have to port the heck out of the 80 mm to really get a good gain. I have not got it yet still waiting on Overkill to ship it.