If you're set on using the airbox, I'd recommend one of these panels, cut to fit...

Ramair panel filter

Make sure you select the correct size!
_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

Check us out on Facebook! Please "like" our page!