dan51

hey guys just fixed all the boost leaks and replaced the wastegate with a tial 14.5 psi spring, its also running a t3 t4 turbo
so its really laggy down low and doesnt hit boost untill 3000rpm then takes off like a rocket at 4500rpm then get this big cut out by 5000rpm if i plant it. whats going on?

Rsniper4

Probably fuel - if you are running stock injectors then you should start by upgrading those. If you're making 400+ hp then an upgraded fuel pump would be a good idea as well.