An intake is a good upgrade the lower intakes on our cars are very restrictive. You can find a used cobra, edelbrock performer(not rpm to much for a mostly stock car) on ebay or in the classified section here. Have you done any exhaust mods like an off road h or x or prochamber(<--makes the most hp out of all of them) mide pipe? It makes no sense to start letting alot of air in if you can't let it out.