@BuiltNotBought Just as GTSboy said.
If you want driveabilty and more low down torque..keep the stock runners.
They are VERY good from a factory.
I have them too on my RB25DET NEO and as a GTSboy i have fmic but with stock piping route(i have Blitz intercooler)
Iam making around 320 BHP and the car pulls "hard" from like 2,5k all the way to 7k.
I have it dyno tuned to mimic N/A power curve and making little less max torque due to the smallbox tranny.
But driveability is very great.
I had 350Nm below 3k so car feels very quick.
EDIT:
Not my channel but i saw this and i know that is what i want (and i have exactly this)