i dont have dyno numbers but getting rid of the airbox makes ALOT more flow. i had a UNI with the stock airbox, no lid. I put a k&n with no airbox and it made a big difference. It went from the a/f running fine to so lean it would hardly run. That would seem bad but now i know how much airflow was restricted. I had to cover the k&N with paper towels to block airflow. once i get a efi controller and richen it up i know it will be a good increase in power over the stock intake.