Timber sled air intake
I put Alan's kit on my 07 XRS 800r last year. It ran better with the airbox, until, I put air screens on both side panels. It was not getting air to cool down the intake. I had a low end delay on throttle. I put cold air screen on both sides. I opended the botton and middle sections with 2 inch holes under the covers. I had an instant improvement. I now feel the benefit. I do like the intake and would put another one on if I had another Rev. Good luck. Alan also has jetting suggestions if you are having issues, call him before you get frustrated.
09 XP X
07 XRS 159
02 Legend 600
05 M6
00 MXZ 600 moded