Today I decided to get a K&N for my AC 500. The salesman at Autozone found one that compared to my old AC PN 0470-391 though it was a bit longer.The book called for K&N PN AC 4096-1, but it was not on the shelf. . K&N PN HA-5000 actually may be a better fit, completely fills the air box.. The kid that sold it to me went on and on, how much more power it would give me! Haha Then he told me that he was putting an electric supercharger on his Dodge Caravan, that was going to give it another 125 hp, hehe. Next he said his last car was a Subaru WRX STI that got a little light at 215 mph.:lol: I can notice the difference with the K&N and removing the snorkel/snout gives her a nice little bark. I'll try to keep it under 215 mph.