This is a concept that is not only for motorcycles, but also in cars. This concept is similar to Ram Air, but he drilled the holes in the back, which will still suck air in, but it is not forced in. I did this on my 2006 Yamaha V Star 1100 but in the front of the air box and the difference in power is noticeable. I drilled a 5/8” hole and covered it with a screen patch embedded into silicone in order to keep debris out. After taking this picture, I did do a second hole below it using the same process.