I've replaced the standard filter elements as well, just to ensure I got the best air flow i could with the stock system. As for new intakes, Volant is the only one I've seen. I've heard of performance improvements but usually when coupled with a new exhaust and reprogramming of the car. I've also seen some posts saying that the Mass Air sensor started throwing error codes after changing the intake system, that stopped me in my tracks. I've seen too many questions about the effect and the errors to convince me to make the move (You may want to do a search on this and other forums). I did go with a Corsa exhaust which didn't make a significant change, but its a little peppier and certainly sounds better. I'd like to see others thoughts in this area as well. Good luck.