Whiter Bros. Rev Kit?

I heard from alot of people that the White Bros. Rev Kit is good and i have beeen thinking about getting one so should i get one on my 400ex. I going to put a 440 in it this winter and a k&n air filter and some other stuff. Let me know if its good

[TravEX]

i've got one new in the box never used for $90 shipping included (you pay extra for insurance),,,interested?

[VegasEx'r]

It's good if you have a highly modified engine. A 440, K&N, etc. isn't enough, what other stuff do you plan to do?