Product details:

Optional Secondary Box Opening:Designed with a secondary inlet, further resulting in even better airflow. A silicone plug is included for those who prefer to pull in air only from the fender inlet.Stronger, better silicone parts:Silicone is a premium rubber that can withstand temperatures up to 400 F and won't crack or tear with age. It's tough yet elastic enough to stretch, then snap into a perfect seal. That's why we used silicone to build this kit's filter, inlet, coupler, and tube sleeve.Large air box and filter.