Lol what does 3hp feel like. It feels like u cant go any where.

You dont measure how fast a car can go by hp you look at the torque curve.

A cai shifts the curves up to higher rpm therefore decreasing acelleration from the bottom end but gaining it at the top end. Most mods mentioned do this.

Even if you have a flywheel that is lightened it does nothing to the torque curve but it gets you to the higher revs quicker therefore better acelleration.

If you had 1000000hp and no torque(impossible but an example) you would go nowhere as the torque is needed.

Torque equals pulling power without it you may aswell just ride a bicycle.