There is made a new airbox to the PVP carburetor, it have 80% bigger volume, than the first gray one, and have on filter inside, to collect some of the dirt can you spray the two bend with chain spray to make it sticky, and then clean them every time after you have bee out on the track, there is a 5 mm. hole in the bottom, so the the water can come out if you drive wet races. The size of the box inside is 155x520 mm. The part number of the airbox is 4031.

Inside the airbox is there this fiber ring as you can see on the photo, to give the perfect bellmouth.