There is not such thing as cheap performance. Cars now days are pushed pretty hard on their engines that is no much room to improve with simple mods. Like mentioned before the best bang for your bucks is a Computer Re-Program and that is all. Beyond that is how deep are your pockets. A Catback exhaust is nothing along with a K&N filter that is also a waste. It might Look Faster ! But on number crunching on a Dyno will tell you that your gain is neglectable.Go with the Computer, if you do not like it, you can always come back without even turning a screw.Good luck :-)