For all the NA intake system mod.
Only one I can physically felt is Throttle body spacer.
For intake, I suggest you keep the stock torque box (one in front of Throttle body)
This will hold your low end torque.
And then custom made CAI to connect to torque box.
For the cone filter, remember not go too big. Otherwise you will lose low end torque again .
This setup is by far the most balanced (keep low end torque and smooth on high speed)