Hammer, at Border's, in the same section that has the Code books is a book titled something like Sportbike Performance, author's last name Cameron. It's similar in size to the Code books, has a ZX-11 on the front cover. That book explains a lot of the principles of operation and performance mods for sportbike engines, suspensions, etc. It might be worth a look to help with the background if you're going to start making changes. I don't own it but have glanced through it and it appeared to have some good basic info.
As far as the airbox mods go, I'd be very slow to touch that in any way unless you have a very specific mod that's tried and proven. Most air boxes are an extension of the whole intake system and what may look to be a problem or an insignificant looking part, may in fact be critical to good performance. As I recall, there was some detail on that subject in that book. Good Luck.
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Last edited by Dad; 11-24-2001 at 06:14 PM.