I'm looking to get a cold air intake system for my 2003 mazda protege. I want to get something in the 200-250 dollar range with dyno tested performance increases. What are some cai systems you'd recommend? I was looking at some aem and k&n ones but can't decide being that I'm a newbie. They all say increased hp gains but I can't find any dyno charts on their products. Any info welcomed.