Nothing... if you want it to be reliable. That little engine is already making more power per liter than most super cars. As far as a swap... put whatever you want in it. There isn't a "Bolt in" engine if that's what you are asking.
Nothing... if you want it to be reliable. That little engine is already making more power per liter than most super cars. As far as a swap... put whatever you want in it. There isn't a "Bolt in" engine if that's what you are asking.