It's funny how many people are quick to say the airbox doesn't work or its a waste of money but no one has it on their bike to test it at the track or dyno. If money is not an issue and you are looking for every advantage then it's worth it. Everyone told me that the "Seal, Ram Air Tubes" by Cycle Tricks didn't work or was a waste of money but this was one of the best mods I ever did along with plugging the drain tube at the bottom of the airbox. I increased by box pressure to .81 bar at a DA of 5925 - amazing. That night I ran 2.5 more MPH on the big end and shaved .11 off my time. At the traps, that rocket was pulling so hard, can't believe it. Think about it, the box is completely sealed with air being rammed in at 146 MPH, the air has only one way in and one way out (through the motor). Trust me, I literally have tried everything and probably every combination with countless number of hours on the dyno and track. Just my two cents but I'll probably try the airbox soon but I need to get the internal volume capacity stat first and compare that to stock.