Have you checked your air filter lately, is it dirty? Rather than modifiy the air box you might try a less restricted air filter element. I'm not a big fan of K&N filters but that might help or better yet do the "Ladder" air filter mod that has been discussed in the past.
Without going into details you basically remove all the paper from the filter frame and replace it with a UNI filter or like I did replace it with the foam element from a NX125 filter. It will breath much easier.
The mod is not something that you can easily do, especially without a dremel tool but you only need to modify the filter frame once and then you have a washable foam filter.
See post 11484-11490 http://www.advrider.com/forums/showt...r#post16069437