Winter Upgrades (Feedback wanted)

I always wonder if the person building a car can actually use the horsepower they build.
Unless this is going to be a drag car I don’t see how.

No offense meant, but I know with my mild 5.9 and 3.55 gears there is no way I can drive my car in town to it’s full potential without wrecking the car or going to jail.
My car run's 10'son street tires. pump gas an through the muffler's. It will idle and drive around town all day without issue as well.

Can I run it to it's full potential around town power wise, not really, but there is no sacrifice in my case.

What car can you run to it's full power potential around town or on roads? None, at least not legally.