According to the manufacturers, these can improve power from 5 to 10 hp. That is only at high RPM and would really only be noticeable at a drag strip. It looks good but won't help much around town, you need more low-end torque to help you there.
ram intake can take more air to the engine, it gives more kick to your engine coz it allows the immediate flow of cold air. Then replace your headers with bigger ones and change the whole pipings of the car.
__________ ram air intake