I acquired a K&N filter with my SH when I purchase it years ago. I, like many others, was never able to get it to run just right with it so I went with 8451 Hawks guidelines with an OEM filter and have loved it for over 30k miles. I've read everything from K&N's causing turbulence to slide flutter. What ever the cause, I was looking at my unused K&N, and was bored, I decided to fabricate a dam/baffle similar to what is part of the OEM filter. So now it's like the stocker in configuration. Only the element is different. I did a half dozen plug chops and settled on an additional .20 additional spacer under the OEM needles and a 1/4 turn out on the fuel screws and it seemed okay. I took 'er for a 320 mile test ride today. the ride was a combination of 215 hilly curves and a 105 mile of freeway. Going from sea level to 7350 ft. elevation and back. Temps varied from 59 - 93 degree. Amazingly I found no noticeable flat spots or other carburation glitches! It "seemed" to run better at all rev ranges and altitudes. When my local dyno ban (long story) is over I'll see what the reality is. Another plus is that that YLOD doesn't come on until about 115 mi. I do run a 19 liter tank. so I picked up about 10% better mileage. It's apparent that I'm running leaner, but it's barely detectable on the plugs after 6 readings on new plugs. I readying a set of extra head pipes with bungs for AFR readings out of each cylinder rather than the (mixed) tail pipes. So, Dam the K&N! It works, for me. I should mention that I have Two Brothers Head Pipes, Yosh slip-ons, Dr. Honda stacks, TPS @500 ohms, 48 pilots, 175 frt. & 178 rr. mains, Shimmed OEM needles with 2 lift holes in stock slides.