get more ps out of my mondeo

hello so I’m driving a ford mondeo 1.8L 16V petrol.has 115ps.is already completely spoiled and painted in yellow-black.will have some more power so I say that the car has to the 140Ps.Wanted to ask if someone can tell me here tips what I can get out of the engine and how exactly, so which parts I should change. mfg tuner