Air box mod? Pros and cons

[Ward P]

I'm not mechanic (not even close) but my 2 cents.
The flapper operates below about 2500rpm, so it would probably make more difference when idleing off the mark and cruising around town. The busa is doing 2000rpm at 60kmph in top, and will happily do it.

I tend to get the feeling that most people that have done it don't bother to get their bikes re-tuned to suit, so that's why the mis-conception of it losing midrange. If you do it, follow thru and get it dynoed, bit like when you add a pipe.
(How many bikes do you hear farting and popping on decel with a non-tuned aftermarket pipe!)

Get Volvi's comment on the difference of feel, as he had it the flapper removed for several years, but then swapped back to standard.