What do i need to upgrade for turbo?
well there are quite a few different setups for a turbo. if you want to make it easy search for a turbo kit made for your civic si. that should come with just about everything, extras may include larger injectors, management system, and other parts if you want more power than what you would get with just a turbo kit (extras will be separate from the kit). im not exactly sure how much it will cost since its an si but i would think its would be in the 3000-5000 range, most likely in the lower end pricing.
