Civic EG

Hey guys so I have a question and have Been Confused about this for a while, I have a jdm b16a in my eg, I have a skunk2 intake manifold and 70mm skunk2 throttle body, stock cams, supertech valvetrain. , Injen intake,GSR transmission, yonaka header with 2.5inch exhaust to a garbage muffler lol putting a vibrant stealth on soon.

Everyone is saying im losing low end power with the bigger manifold and tb. Would I be better off getting an ITR manifold and tb instead? I want to boost maybe next year

But..when you are going fast your in high rpms the whole time anyway?

Have you Dyno the car to confirm loss of power?

Yeah, you would be losing power.
Think of it as trying to drink a Big Gulp with a really huge straw. Try it if you don't follow. Use a toilet paper roll lol. You'll get a lot more from a standard straw.
First you need to increase the suction of the pump. Pistons, cams, head porting and oversized valves. At that point the throttle body and intake manifold become a restriction and upgrading them will be beneficial.