RedlinedEG

so i have a k20a3 motor in my eg hatch with basic mods i/h/e and im starting to get some complications with my motor.i dont have kpro im using my stock pnd ecu that came from the wrecked rsx along with the wiring.

i have no check engine lights on and no error codes on my obd2 reader but after going past 2500-3000 rpm my oil light flickers for a lil bit and my motor bogs really bad then the oil light tuns off and its normal again. but recently my car started to not rev up past 4000. ive been told its in limp mode.
is there a way to get this taken off?

ive been thinking maybe this could mean that i really need to change my oil pump? you guys think this would fix my problem?