r/Fiat126

I have some questions

1. How to increase the horsepower of the fiat 126?
2. Is It really that easy to modify/tuning? Like, an amateur can do things like, power cut off button? Or should i do it with a help of a mechanic? Im on point here.

Does anyone have expirience with the fuse B/2 that burns when I leave the clutch pedal too fast?

The fuse is for stop light, ventilation, turn signals, dashboard handbrake and gas level.

I tried to check the wiring. I've checked most of the connections, but not thought the whole car.