I just Installed Graydon Proline's aluminum airbox. The thing is sweet Its got this huge K&N filtercharger (for 250r),...Outerwear pre-filter,...and Outerwear lid for the airbox. You can check out the airbox at: http://www.imagestation.com/album/?id=4292191521 last couple pic's... airbox was like 199. K&N 48. outerwears 14. 18. Raptor pulls much harder than before but still working on jetting.null

 

IM WONDERING HOW YOU MADE OUT ON YOUR JETTING.WHAT SIZE DID YOU END UP WITH . IM ASKING BECAUSE IM THINKING OF PUTTING A GRAYDON OR SPARKS AIRBOX ON MY RAPTOR, BUT I CANT GET A REPLY FROM ANYONE WITH ONE OF THESE AIRBOXES. I GUESS YOU LIKED THE GRAYDON. I HAVE A FULL TITANIUM YOSH PIPE WITH 150/155 JETS WITH NO SNORKLE AND THE BIKE RUNS LEAN. ONCE I PUT THAT AIRBOX ON I KNOW I WILL HAVE TO GO BIGGER ON THE JETS. ANY INFO WILL BE HELPFUL. THANKS

 

160/165 Mikuni's with a slip on exhaust and Graydon airbox. Top end was good but low/mid was lean. Went to 148/150 dynojets and needles. A little rich. Droped the needles to 3rd clip and runs good.

 

I love it! I use the Dyno jet kit 148/150, 27.5 pilots, 4 clip. the thing is awsome!!!