Airbox mod on GenII

[supersonic]

I've heard about an airbox mod on the gen II for better performance. Does anyone know what this mod is?

 

[scottyd]

Start here: http://www.998cc.org/forum/gen-ii-mods/7114-gen-ii-mods-start-here.html

Or one of these two:
5177-air-box-mod
http://www.998cc.org/forum/gen-ii-mods/5798-first-performance-mods.html