[CODE4]

If speaking about the filter element specifically then K&N makes the best filter elements. Never buy some cone air filter from Car Quest or any other generic one. A fellow DSMer did that because he accidentally drove over his K&N and the metal button looking thing on the end of it popped off while at high way speed and got sucked into the turbo. Needless to say that cost much money because of skimping on a filter.

No matter what kind of piping you have, do yourself a favor and buy a K&N.