yeah 3.5-4.5k about a average of 35hp more but from 4.5-8k about a 50hp average more
i dont know what crack you have been smoking butters, but when do you have revs less than 4.5k down a quarter mile
i remember the difference in speed of my car on lowish boost (19psi 510rwhp) and high boost (24psi 574rwhp) was not even comparable... 510 was fvcking fast, 574 was just scary