Its all going to depend on the kit you get. Turbos generally can give more performance for the money. But you can only go so far with the stock motor. I prefer the instant boost of a roots type blower. Centrifical superchargers are nice too, and there are alot of kits out there with alot of different options. Most kits will set you back between $5,500 - $7,500 for a basic kit on a stock motor, you will want to limit your boost to between 5-8 lbs on stock motors.