Hello I bought a Peugeot 306 xn (1.4 carburated) and I want to improve, I mean faster a few days ago I bought spark plugs and high performance cables, but I don't know what else I can do someone can give me data please, thank you.
If what you want is speed modifies the cylinder head, this has to do it with an experience, tell him that the revive and change the angle of the valves and you will see how he runs. In these cases there will be a conical air filter to give you benefits.