The boost does all the work
This^^^
If the turbo is selected well (like, ask the manufacturer?), the rest doesn't matter nearly as much as NA.
If it's not (2 common mistakes: way too big (88mm on a 318), 2.0 A/R (no boost below 6,000) the rest is a waste of time.
The difference between a tuned header fabricated to fit and a pair of iron logs may be 50 hp on a 7-800 hp engine, and $2,000. A bad cam choice (typically too narrow LSA) is worse than the stock cam.

But you don't get to say "It's 800 cubes".