It depends on how much you want to spend and if you wanna do it yourself or have done to it. First thing that you could do is having an after market exhaust installed, or a cold air intake, or simply changing the spark plugs could give you a little bit of power, but if you are thinking more about hardcore horse power added you are gonna need a turbo and of course there should not be turbo if there is not an intercooler that plus the aftermarket exhaust will get you rolling fast. So you should specify what kind of money you are willing to pay and/or if you wanna do it yourself