The first thing you can do for your car to increase horsepower is to buy air intake. There are many types of air intake. There is a cold air intake, short ram intake, air cooler box, etc. The most efficient and efficient air absorption in Cold Water Taking. It usually adds about 4-6 horsepower depending on your vehicle. giving the sound of a 'noisy' engine especially on high acceleration that makes the car sound more fierce. In addition, short intake pipe distance will indeed slightly improve the throttle response. ability to improve engine performance. Whereas in the dyno test results as already mentioned, the increase is not significant (very small). Even in some other test results actually reduce the engine performance.
When the engine is alive, the cash is sucked by the engine, but always replaced by the outside air through the filter. The problem is, the speed of replacing that always lose with the speed of the engine suck it. Let there be no filter that blocks. Without a filter, the incoming air discharge is still inferior to the engine straw discharge. Therefore, the air pressure in the intake space is always below 1 atmosphere. The closer the filter the lower the pressure
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From @andromeda1