K&N are good mate yeah. ive used both K&N and Pipercross over the years, had a K&N panel filter at first, that worked well. then changed it for a K&N induction kit, and although it sounded very nice, it suffered badly from heatsoke, and as i said, ive now got an enclosed viper, and thats the best of the lot, but they are very expensive, you will pay nearly as much as you paid for the car for a viper lol