The one the factor installed on it., Replaced the air filter with a KM that fits in the factor air box.
well this depends on how much your wanting to to spend and what your wanting to get out of the car but check out these parts summit racing has 2 cat backs part numbers PSM-88-1474 , BOR-14821 and on the air filter i check summit and k n fiters web site and the only fiter the offer is KNN-33-2121-1 but if you wanted a true ram air you would need to take a look at how it all hooks to your throllte intake and you might can fab something pretty easy i have to fab a cold air intake on my moms 2003 kia and it cost under 65 dollars from auto zone and orilies
