1997-2004 Twin Flow Air intake. Eckler's advertises this product as increasing 14hp. It's definitley a nice induction and does have a noticeable increase in power. Eckler's sells it for $359.99 plus shipping. Part number 35478. I am taking offers if anyone is interested. Mine has less than 8k miles on it and I just cleaned the filters with the K&N filter maintenance kit. So it's ready to go and easy to install. I can email pics to anyone....for some odd reason I can't upload it here.