I'll be honest. It's tough and expensive to make a 4 cyl. go fast but if you really want to make it go, look into forced induction. i.e turbo, NOS etc...But either of those require to have the engine pretty much built to handle the stress a turbo or NOS puts out. Your looking at thousands of dollars to make your car go fast and to add HP. Your intake and exhaust will probably only add 10-15 HP.