Basically,,,, NO unless you go for a full system and maybe a decat.
What engine are you tryin to squeeze ?
A good full service is always good. Plugs and leads too.
twin / triple electrode spark plugs help, my bravo 1.2 has (non fiat recognised) plugs fitted. ngk twins. Much better. Unfortunatly, as I cannot get my bonnet open due to a smashed front end, i cant tell you atm what plug number they are. sorry.
Personally (tried n tested) Ram air is far better then a cone with cold feed by far ! however most people like cones for the noise. I did a k&n panel and a direct cold feed from under the bumper. (previously had a cone filter and now have (had) better power gains by far !!!
hope thats a start 4 ya !!
babj