Who've told you this?
If adding horses was too cheap anyone would do as you said.
Horses achieve karna is not that easy bro.
And multi tip plugs ya iridium plugs are not going to increase 3-5 horses.
High performance filters alone don't do magic either sir.
Good oil are necessary.
Liquimoly, amsoil or Lucas.
These three are some expensive and quality oils.
Horses can be achieved by using bigger intake, bigger exhaust pipe, custom Headers, and then running up some tuner chips or vafc's.
Then you can claim horses increase.
@umarmuslim
