Yes, of course a modded Supra will run fast all the way to the top, and your car may too.
But what are you comparing it too?
If all else is equal (gearing, weight, aerodynamics, etc) one car with a blown 6 cylinder making 500 hp and another with a high revving NA V8 making 500 hp, sure the blown 6 is going to feel fast (and certainly will be especially down low, but I'd put my money on the high revving V8 taking it and pulling harder as the speeds increase to 120, 140, 150+ mph.
This is of course, if your at or near sea level too.
Then you have to take multiple runs into consideration with F/I cars. Heatsoak is always prevalent with them. Where N/A engines get very warm and may lose a bit of power, F/I engines get very HOT and lose significant power. Sure you can combat this a decent amount with larger intercoolers, oil coolers, meth, etc. But again comparing pretty much stock for stock. Start adding equivalent mods to a NA V8 as to a F/I 4 or 6 and then well you have another comparison all together.
twin turbo V12's are more luxury cruisers they don't rev much therefore they have lots of low and mid range grunt, but are much more "relaxed" at higher rpms. I prefer TT V8's anyday (lighter and rev up too).
And don't get me wrong, I like F/I engines, of the 35+ cars I've owned in 20 or so years, 7-8 of them have been F/I (my last 4 cars included Legacy GT, then two BMW 335i's and now this WRX)