To help the top-end pull of a 14b, you simply have to upgrade to a turbo bigger than a 14b. Either that, or just cope with low-6000 rpm range shift points. Even my friend's Evo 16g runs out of steam around 6800, airflow starts dropping off. He has some comp 200's to drop in which may help, but the turbo just isn't big enough to maintain the same airflow after 7000 rpm.